Chapter 14 of the Chicago Manual of Style presents Chicago's bibliography style of citation. This style, as described in section 14.2 of the Manual, "uses a system of notes, whether footnotes or endnotes or both, and usually a bibliography." (Sections 14.38 through 14.40 of the Manual present a discussion on when best to use footnotes vs. when best to use endnotes).
Footnotes and endnotes are formulated in exactly the same way -- the only difference is that footnotes appear on the bottom of the page on which a work is cited, whereas endnotes appear at the end of a manuscript. Citations in a bibliography are formulated in a similar way to a footnote or endnote, but do have slight variations from the way a footnote or endnote is formulated.
Most courses at Chico State that uses Chicago's bibliography style ask you to cite sources using footnotes as opposed to endnotes. All courses require a bibliography to accompany your notes. Ask your instructor if you have further questions about the elements of the Chicago style s/he wants you to use in completing your coursework.
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