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blog.apastyle.org/apastyle/2011/02/et-al-when-and-how.html

Feb 4, 2011 ... Writers sometimes use the surname of the first author followed by et al. at the first mention of a work that has three, four, or five authors. Only when a work has six or more authors should the first in-text citation consist of the first author followed by et al. With five or fewer authors, all the author surnames ...

www.gingersoftware.com/english-online/spelling-book/confusing-words/etc-et-al

Keep using etc. instead of et al.? Check out Ginger's spelling book and make sure you never confuse etc. and et al. again!