Notes-Bibliography Style
Every time you refer to one of your sources, you want to include a numbered footnote that contains all the information about that source (author, title, publication info, and page number). Notes will be listed at the bottom of the page as footnotes, or at the end of your paper as endnotes.
According to one scholar, "The railroads had made Chicago the most important meeting place between East and West." 4
Your footnote or endnote will look like this:
4. William Cronon, Nature's Metropolis: Chicago and the Great West (New York: W.W. Norton, 1991), 92-93.
If you cite the same text again, you can shorten the subsequent note.
8. Cronon, Nature's Metropolis, 383.
You will also create a complete list of your sources at the end of your paper in a bibliography.
Cronon, William, Nature's Metropolis: Chicago and the Great West. New York: W.W. Norton, 1991.