Why do you think there are different standardized writing formats like APA and MLA?

Today, most of the people of the modernized world use to have a desire to writing his or her personal research paper in different styles. Different standardized writing formats like APA and MLA because of their dissimilar usage. Like, APA is most commonly used to cite sources for papers within the Social Sciences. On the other hand, MLA is being used for papers within the literature, arts, English, languages, history or philosophy.