In-text citation
The body’s basal metabolic rate, or BMR, is a measure of its at-rest energy requirement (“Exercise,” 2003).
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Note on “Anonymous”
In the rare case when “Anonymous” is specified as the author, treat it as if it were a real name: (Anonymous, 2013). In the list of references, also use the name Anonymous as the author.
Beginning of reference list entry
Exercise and diet: Key factors in treating childhood obesity. (2003).
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