From Purdue Online Writing Lab:
APA (American Psychological Association) style is most commonly used to cite sources within the social sciences.
In APA, your citations will be in text in parentheses, and your bibliography will be at the end on a page called References.
From Purdue Online Writing Lab:
MLA (Modern Language Association) style is most commonly used to write papers and cite sources within the liberal arts and humanities.
In MLA, your citations will be in text in parentheses, and your bibliography will be at the end on a page called Works Cited.