thank you for your feedback actually , but we have several reason , the first reason is this game purpose is for our artist showcase purpose (Kamo-Pasta) not for actual research about youkai itself , the second is about folklore , one of our team have a background in college in the major of Literature , the folklore is the one and the only one that you "dont have" to put a source or a citation in the note because folklore is based from local culture and the myth not for actual fact, the last reason we already put some valid source for the Tumblr youkai in there , so that means , it is okay for us to just put only in Tumblr not in the other knowledge website like wikipedia or the other same thing, thank you :)