diff --git a/attributes/doc.go b/attributes/doc.go
index 0bf9e83a..4c9a2c3e 100644
--- a/attributes/doc.go
+++ b/attributes/doc.go
@@ -18,3 +18,6 @@ package attributes
 
 // This package contains helper functions when creating new attributes.
 // WARNING: The helper functions (attribute.Reflect) in this package use reflection and therefore will incur a performance penalty.
+
+// Similar implementation to the go-ipld-prime library.
+// Reference: https://github.com/ipld/go-ipld-prime/tree/master/node/basicnode
diff --git a/model/traversal/budget.go b/model/traversal/budget.go
index af8f3b6f..cf021b9e 100644
--- a/model/traversal/budget.go
+++ b/model/traversal/budget.go
@@ -6,6 +6,9 @@ import (
 	"github.com/emporous/emporous-go/model"
 )
 
+// Similar to the budget in the go-ipld-prime library.
+// Reference: https://github.com/ipld/go-ipld-prime/blob/ab0f17bec1e700e4c76a6bbc28e7260cea7c035d/traversal/fns.go#L114
+
 // Budget tracks budgeted operations during graph traversal.
 type Budget struct {
 	// Maximum numbers of nodes to visit in a single traversal operator before stopping.
diff --git a/nodes/collection/collection.go b/nodes/collection/collection.go
index c07d4493..88b62aa7 100644
--- a/nodes/collection/collection.go
+++ b/nodes/collection/collection.go
@@ -14,6 +14,11 @@ var (
 	_ model.Iterator = &Collection{}
 )
 
+// Adapted from gonum/graph/simple/directed.go.
+// Reference: https://github.com/gonum/gonum/blob/e8ed540b8ee27ad9adf717046542d9ed24eb9215/graph/simple/directed.go#L36
+// Copyright ©2013 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+
 // Collection is implementation of a model Node represent one OCI artifact
 // stored in memory.
 // WARNING: Collection type is not thread-safe.
diff --git a/nodes/collection/iterator.go b/nodes/collection/iterator.go
index 37d44f4c..597e89c4 100644
--- a/nodes/collection/iterator.go
+++ b/nodes/collection/iterator.go
@@ -11,6 +11,13 @@ var (
 	_ model.Iterator = &ByAttributesIterator{}
 )
 
+// Adapted from gonum/graph/iterator/nodes.go
+// Reference: https://github.com/gonum/gonum/blob/master/graph/iterator/nodes.go
+// Copyright ©2013 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+
+// Note(jpower432): Could possibly removed or deprecated. I do not believe this is used anywhere.
+
 // InOrderIterator implements the model.Iterator interface and traverse the nodes
 // in the order provided.
 type InOrderIterator struct {
diff --git a/nodes/collection/loader/manifest_to_collection.go b/nodes/collection/loader/manifest_to_collection.go
index 0d717a3d..a5fc32c1 100644
--- a/nodes/collection/loader/manifest_to_collection.go
+++ b/nodes/collection/loader/manifest_to_collection.go
@@ -126,6 +126,14 @@ func addOrGetNode(graph *collection.Collection, desc ocispec.Descriptor) (model.
 	return n, nil
 }
 
+// Adapted from the `oras` content.Successors.
+// Reference: https://github.com/oras-project/oras-go/blob/a428ca67f59b94f7365298870bcac78c769b80bd/content/graph.go#L50
+// Copyright The ORAS Authors.
+// Apache License 2.0
+// Changes:
+// - Added FetcherFunc to allow for custom fetching of content.
+
+
 // getSuccessor returns the nodes directly pointed by the current node. This is adapted from the `oras` content.Successors
 // to allow the use of a function signature to pull descriptor content.
 func getSuccessors(ctx context.Context, fetcher FetcherFunc, node ocispec.Descriptor) ([]ocispec.Descriptor, error) {
diff --git a/registryclient/orasclient/oras.go b/registryclient/orasclient/oras.go
index 8a1a039b..de4c3c34 100644
--- a/registryclient/orasclient/oras.go
+++ b/registryclient/orasclient/oras.go
@@ -426,7 +426,8 @@ func (c *orasClient) setupRepo(ref string) (*remote.Repository, error) {
 }
 
 // TODO(jpower432): PR upstream so that this can be done with the pre-copy option. Currently the error to skip descriptors is
-// private https://github.com/oras-project/oras-go/blob/9e5b1419cdedd6240a5bf836c83f75270ba9d74b/copy.go#L49.
+// private 
+// Reference: https://github.com/oras-project/oras-go/blob/9e5b1419cdedd6240a5bf836c83f75270ba9d74b/copy.go#L49.
 
 // successorFnWithSparseManifest defines a successor function to use with oras.Copy that will skip any expected linked content (i.e. sparse manifests)
 func successorFnWithSparseManifests(ctx context.Context, fetcher orascontent.Fetcher, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
diff --git a/registryclient/orasclient/pack.go b/registryclient/orasclient/pack.go
index c0984901..2d634fb7 100644
--- a/registryclient/orasclient/pack.go
+++ b/registryclient/orasclient/pack.go
@@ -32,10 +32,13 @@ var (
 	ErrInvalidDateTimeFormat = errors.New("invalid date and time format")
 )
 
-// PackOptions and Pack are modified version of the upstream oras.Pack.
-// The main difference is that the timestamp information is not optional in the annotations.
-// To ensure digest reproducibility for this effort, timestamp information will be collected and stored
-// in predicate information in the artifact attestations.
+// PackOptions and Pack are modified versions of the upstream oras.Pack.
+// Reference: https://github.com/oras-project/oras-go/blob/main/pack.go
+// Copyright The ORAS Authors.
+// Apache License 2.0
+// Changes:
+// - Add `DisableTimestamp` option to disable the creation timestamp annotation.
+
 // TODO(jpower432): PR this back to `oras-go` if it makes sense.
 
 // PackOptions contains parameters for Pack.