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Chicago Style Guide

Creating a note using shortened form

When creating your notes, you should provide a complete citation the first time you use a source, and use a shortened form for subsequent notes. This only applies to footnotes or endnotes - in the bibliography you will create one citation for each source you used.
Use of ibid.
Ibid. is an abbreviation for ibidem,  meaning "in the same place." Use Ibid. as shortened form when you have cited a source in the preceding note. Don't forget the period at the end.
First citation

1. Doug Fine, Farewell My Subaru: an Epic Adventure in Social Living, ((New York: Villard, 2008), 45.

Next note, same source, same page 2. Ibid.
Next note, same source, different page 3. Ibid., 36.
Pay attention to the punctuation! Since Ibid. is an abbreviation, it needs both a period and a comma before the page number.
Shortened form for a book
First citation

1. Doug Fine, Farewell My Suburu: an Epic Adventure in Social Living (New York: Villard, 2008), 45.

Next note, same source, same page 2. Ibid.
Several notes later 6. Fine.
Shortened form for a website
First citation

1. "Barack Obama on Budget & Economy," September 4, 2011, On the Issues, http://www.issues2000.org.

Several notes later 4. "Barack Obama on Budget & Economy."