In fairness to the Modern Language Association and other makers of popular academic style guides, citing sources -- if always tedious -- was once relatively straightforward: journal articles like this, books like that. But the proliferation of media sources -- especially electronic ones -- in recent years has made writing citations confusing at best (and purgatorial at worst).
https://www.insidehighered.com/news/2016/03/31/new-mla-handbook-wants-make-citing-sources-variety-media-much-easier Inside Higher Ed