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Chicago Citation Style, 18th Edition

A University of Lethbridge Library guide to Chicago Manual of Style citations.

E-Books
(Sections 14.58-14.62)

Citations for e-books consulted online are very similar to those for print books apart from the URL included. When possible, a URL based on a DOI should be used. For an explanation of DOIs, see the box below. For more information on citing e-books consulted online, see the Manual, 14.161.

Please note that Chicago now omits the place of publication for books published after 1900 (see the Manual, 14.30). For books published before 1900, they recommend using the place of publication instead of the publisher itself, as it is of greater interest (see the Manual, 14.31).

Example 1 – Online E-Book
N: 1. Charles Brian Rose, The Archaeology of Greek and Roman Troy (Cambridge University Press, 2014), 255,
https://ebookcentral.proquest.com/lib/uleth/detail.action?docID=1543600.
B: Rose, Charles Brian. The Archaeology of Greek and Roman Troy. Cambridge University Press,
            2014. https://ebookcentral.proquest.com/lib/uleth/detail.action?docID=1543600.

 

Example 2 – Downloaded E-Book
N: 1. Margaret Atwood, The Heart Goes Last (McClelland & Stewart, 2016), chap. 3, Kindle.
B: Atwood, Margaret. The Heart Goes Last. McClelland & Stewart, 2016. Kindle. 

DOI - Digital Object Identifier

Most scholarly publishers now assign a unique alpha-numeric code called a DOI (Digital Object Identifier) to journal articles, e-books, and other documents. Chicago guidelines for citing electronic resources include this number in the citation whenever possible. The DOI can generally be found on the first page of scholarly journal articles as well as in the database record for that article. DOIs are typically provided within a URL beginning with https://uleth.idm.oclc.org/login?url= and ending with the DOI, as seen in this example: https://login.uleth.idm.oclc.org/login?url=https://www.doi.org/10.2307/j.ctt22zmc3w.

If the DOI does not appear on the article or in the database record, it may be found by entering citation information into the free DOI Lookup on CrossRef.org.

To determine DOIs for an entire reference list, copy & paste the entire list here: Cross/Ref Simple Text Query.

A DOI can be searched or verified by entering the DOI number here: Cross/Ref DOI Resolver.

Materials originally published prior to the Internet, but now available online, may not have a DOI. When a DOI is not available, include the URL in its place.