Sample papers in the first printing of the sixth edition contained errors. APA staff posted all of the corrections online for free in a single document on October 1, 2009, and shortly thereafter alerted users to the existence of the corrections in an APA blog entry.  These errors attracted significant attention from the scholarly community and nearly two weeks later, on October 13, 2009, the article "Correcting a Style Guide" was published in the online newspaper Inside Higher Ed that included interviews with several individuals, one of whom described the errors as " egregious ".  All copies of the printing with errors were soon after recalled in 2009 (including those from major retailers such as ) and all manuals currently in circulation are unaffected.
“Secondary source” is the term used to describe material that is cited in another source. If in his article entitled “Behavioral Study of Obedience” (1963), Stanley Milgram makes reference to the ideas of Snow (presented above), Snow (1961) is the primary source, and Milgram (1963) is the secondary source. Try to avoid using secondary sources in your
papers; in other words, try to find the primary source and read it before citing it in your own work. If you must use a secondary source, however, you should cite it in the following way: