There is not a required style for citations and formatting. The directions require consistency from the student. Either MLA or APA style can be used.
You can use our Academic Honesty Handbook or the Online Writing Lab (OWL) from Purdue University for guidelines and style questions.
Here is a page with some suggestions on formal requirements and things to consider before submitting your final draft
Here is a page with a checklist for the final draft of the essay.