diff --git a/server/interfaces/models/IBook.ts b/server/interfaces/models/IBook.ts
index e54e9c2..76e858c 100644
--- a/server/interfaces/models/IBook.ts
+++ b/server/interfaces/models/IBook.ts
@@ -1,9 +1,10 @@
+import { ObjectID } from "bson";
 import { IModel } from "./IModel";
 
 export interface IBook {
     _id: string;
     title: string;
-    authors: string[];
+    authors: string[] | ObjectID[];
     genres: string[];
     location: string;
     owner: string;