Update on Overleaf.

main.tex

@@ -157,7 +157,7 @@ Topologically, holes can be detected using homotopy groups (the group of loops i
 	\centering
     \captionsetup{width=.75\linewidth}
 	\includegraphics[width=0.25\linewidth]{Contractible loops.png}
-	\caption{Diagram showing two double tori. The red dotted path on the top double torus is a contractible loop, while the red path on the bottom one is not contractible. \cite{Herlihy_1996}}
+	\caption{Diagram showing two double tori. The red dotted path on the top double torus is a contractible loop, while the red path on the bottom one is not contractible. Image source: \cite{Herlihy_1996}}
 	\label{fig:CoLoop}
 \end{figure}