A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Record your sources fully, accurately, and appropriately - Determine your citation style
Finding useful sources
Part I. Research and writing: from planning to production

Before you look for sources, you should know how to cite the ones you find. Your readers will trust your report only if they trust your evidence, and they won't trust your evidence if they can't find your sources. Your first obligation as a researcher is to cite your sources accurately and fully so that your readers can find them.

3.2.1 Determine your citation style

Most fields require a specific citation style. The two most common ones are described in detail in part 2:

notes-bibliography style (or simply bibliography style), used widely in the humanities and in some social sciences (see chapters 16 and 17)

parenthetical citations—reference list style (or simply reference list style), used in most social sciences and in the natural sciences (see chapters 18 and 19)

If you are uncertain which style to use, consult your instructor. Before you start compiling your list of sources, read the general introduction to citations in chapter 15, then depending on the citation style you are required to use, read the introduction to bibliography style (chapter 16) or reference list style (chapter 18).