diff --git a/metrics/multimetric.sh b/metrics/multimetric.sh
index a18e3350..9220642e 100755
--- a/metrics/multimetric.sh
+++ b/metrics/multimetric.sh
@@ -33,9 +33,9 @@ temp="${TARGET}/temp/multimetric.json"
 mkdir -p "$(dirname "${temp}")"
 echo "${body}" > "${temp}"
 cat <<EOT> "${output}"
-HSD $(echo "${body}" | jq '.halstead_difficulty' | "${LOCAL}/help/float.sh") \href{https://en.wikipedia.org/wiki/Halstead_complexity_measures}{Halstead Difficulty}
-HSE $(echo "${body}" | jq '.halstead_effort' | "${LOCAL}/help/float.sh") \href{https://en.wikipedia.org/wiki/Halstead_complexity_measures}{Halstead Effort}
-HSV $(echo "${body}" | jq '.halstead_volume' | "${LOCAL}/help/float.sh") \href{https://en.wikipedia.org/wiki/Halstead_complexity_measures}{Halstead Volume}
+HSD $(echo "${body}" | jq '.halstead_difficulty' | "${LOCAL}/help/float.sh") Halstead Difficulty~\citep{halstead1977elements}
+HSE $(echo "${body}" | jq '.halstead_effort' | "${LOCAL}/help/float.sh") Halstead Effort~\citep{halstead1977elements}
+HSV $(echo "${body}" | jq '.halstead_volume' | "${LOCAL}/help/float.sh") Halstead Volume~\citep{halstead1977elements}
 MIdx $(echo "${body}" | jq '.maintainability_index' | "${LOCAL}/help/float.sh") Maintainability Index~\citep{coleman1994}
 FOut $(echo "${body}" | jq '.fanout_external' | "${LOCAL}/help/float.sh") \href{https://en.wikipedia.org/wiki/Fan-out_(software)}{Fan-Out}
 EOT
diff --git a/tex/report.bib b/tex/report.bib
index a2f54b52..de4a9da0 100644
--- a/tex/report.bib
+++ b/tex/report.bib
@@ -170,8 +170,17 @@ @article{coleman1994
   author = {Coleman, Don and Ash, Dan and Lowther, Bruce and Oman, Paul},
   doi = {10.1109/2.303623},
   journal = {{Computer}},
+  volume={27},
+  number={8},
   publisher = {IEEE},
   title = {{Using Metrics to Evaluate Software System Maintainability}},
   year = {1994},
-  doi={10.1109/2.303623}
+}
+
+@book{halstead1977elements,
+  author = {Halstead, Maurice H.},
+  doi = {10.5555/540137},
+  publisher = {Elsevier},
+  title = {{Elements of Software Science (Operating and Programming Systems Series)}},
+  year = {1977},
 }