In APA Style, there are two elements needed to properly cite each of your sources:
The reference list entry - information about the article that appears at the end of your paper in the list of references
The in-text citation - brief information that appears in the body of your paper to indicate a direct quote or paraphrase.
Several of the examples in this guide were drawn from the APA Manual (6th ed.).
Numbers in parentheses refer to specific pages in the APA Manual (6th ed.).
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The place of publication is the name of the city where the publisher is located (p. 186). The place can be found on the title page or verso (back) of the title page. Use the first city listed or the city where the publisher's headquarters is located.
See this example to help you locate a book's place of publication, publisher name, and other info required for an APA citation.
If a Digital Object Identifier (DOI) is listed on either a print or an electronic source it is included in the reference. A DOI is a unique alphanumeric string that is used to identify a certain source (typically journal articles).