Thread:RuneLai/@comment-30473998-20180614015511

https://attackontitan.wikia.com/wiki/Unknown_writing I was skimming through this page when I happened to notice the reference box, and noted that reference 5 wasn't directly from the Attack on Titan manga.

I couldn't find anything underneath the Manual of Style that said something against using non-Attack on Titan resources. My question is:

Are we allowed to use non-Attack on Titan resources? And if so, should we also factor in the reliability of the source? 