Should I include a citation in a quotation (APA Style)?
If the text you want to quote provides a citation to the original source of the information, please include the embedded citation in your quotation. As per the American Psychological Association (2010), "the works cited need not be included in the list of references (unless you happen to cite them as primary sources elsewhere in your paper)" (p. 173). Please see below for an example from page 173 in the APA manual in which the citation to the American Cancer Society is the internal citation:
"In the United States, the American Cancer Society (2007) estimated that about 1 million cases of NMSC and 59,940 cases of melanoma would be diagnosed in 2007, with melanoma resulting in 8,110 deaths" (Miller et al., 2009, p. 209).
Using that example, Miller et al.'s (2009) work would be included in the references, but the American Cancer Society's (2007) work would not, unless it was cited directly elsewhere in the document.
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.