It depends on what type it is: book, encyclopedia, web-site, journal.
for a book:
Author's Last name then first name, Title of the work Include entire title as displayed on title page including subtitles. Capitalize important words, Type special edition information (i.e., 1st ed., 3rd ed., Rev. ed., Expanded ed.), Number(s) of the volume(s) used (i.e., 5 vols), Publishing City City & State initials or Country separate with a comma (,), Publishing Company, Year Published, Pages, medium (i.e. print, e-book).