Which should you use?
Ask each of your teachers which style they want you to use. If they have no preference, you can use any or follow these guidelines:

• APA: psychology, education, and other social sciences.
• MLA: literature, arts, and humanities.
• AMA: medicine, health, and biological sciences.
• Turabian: designed for college students to use with all subjects.
• Chicago: used with all subjects in the "real world" by books, magazines, newspapers, and other non-scholarly publications.