See APA 6.12 on the use of the word and versus the symbol &. Join the names in a multiple-author citation in manuscript text with the word and. Join the names with & in parenthetical citations, tables and captions, and the reference list. Doing a search (Edit > Find) can help you quickly find ampersands in your text if you think you have used them incorrectly.
For example: Jones and Smith (2013) conducted a study on the flight of geese.
The study was on the flight of geese (Jones & Smith, 2013)
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