About Using a Style Guide
Footnotes and bibliographic citations credit the author and enable the reader to locate source material. As you compile and cite references, be sure to observe a consistent style -- that is, don't mix APA-style citations with MLA-style references.
Complete citations to online or electronic resources are also required in the same manner as for printed sources.
Be sure to check your syllabus or ask your professor which style guide is appropriate and/or required for your paper.