The Department of Civil War Era Studies recommends using the Turabian citation style.
Newly revised to conform with the Chicago Manual of Style, Turabian's Manual for Writers provides comprehensive, detailed, superior guidance to writers of research papers. From "Parts of the Paper" (including the niceties of copyrights and dedications) to "Sample Layouts," everything to do with format is covered. Mechanics of style (abbreviations to quotations) are reviewed, there's help on tables and illustrations, and chapters on bibliographies, parenthetical references, note taking, and citations. There are suggestions for manuscript preparation, hints on word-processing software, and formatting for research papers' more complex features.
Take a look at the Turabian Citation Quick Guide to find information about citing common sources.