According to the 6th edition of the APA : "Within a paragraph, when the name of the author is part of the narrative...you need not include the year in subsequent nonparenthetical references to a study as long as the study cannot be confused with other studies cited in the article. Do include the year in all parenthetical citations" (pg. 174).
Owl of Purdue states: “In other words, every time you bring up the author in a new paragraph, you should use the year, but you don’t have to within a paragraph, as long as it’s clear from your wording that you are discussing the same author. If you were giving a direct quotation that needed a parenthetical reference for the page number, then you’d include the year as well.”
Remember, if you list the author in parenthesis, you must include the year.
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