Generally, students writing papers for English courses will document their sources in MLA style. MLA stands for "Modern Language Association."
If your professor asks you to use a different citation style, ask a librarian for help finding the correct style guide. You can also find information for APA and Chicago documentation styles here.
MLA Handbook for Writers of Research Papers
Paul Robeson Library Location
LB 2369.G53 2009
Or find more information about MLA: