Referencing page numbers. When a direct quotation is used, the page number is included in the in-text citations in APA format regardless of the number of authors or type of source. A comma separates the year of publication and the page number. Signal phrase: Coles (2010) found… (p. 35).
http://www.write.com/writing-guides/style-guide-writing/apa/how-to-use-in-text-citations-in-apa-format/
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Quick Guide to Commas. 1. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet. 2. Use commas after introductory a) clauses, b) phrases, or c) words that come before the main clause. 3. Use a pair of commas in the middle of a sentence to set off clauses, phrases, and words that are not essential to the meaning of the sentence. Use one comma before to indicate the beginning of the pause and one at the end to indicate the end of the pause.
https://owl.english.purdue.edu/owl/resource/607/01/
1 APA requires the use of the serial (or Oxford) comma in lists of three or more items (i.e., Groucho, Harpo, and Zeppo).  Most prefixes are not hyphenated: semistructured, nondenominational, multimedia, antisocial, posttest, pretest, and so forth.
http://academicguides.waldenu.edu/writingcenter/apa/other
The basics of in-text citations in APA format. If you are using a direct quote, the in-text citation in APA style calls for the author’s name, the publication date and the page number. On the other hand, indirect quotes require only the author’s name and the publication date.
http://www.write.com/writing-guides/style-guide-writing/apa/how-to-use-in-text-citations-in-apa-format/
Rules for in-text citations in APA format. The rules for in-text citations in APA format change depending on the type of sources, the number of authors and the type of quotations you use. Whether it is the first reference to the source also dictates how you cite sources. A signal phrase is often used to introduce an author in the text of your paper.
http://www.write.com/writing-guides/style-guide-writing/apa/how-to-use-in-text-citations-in-apa-format/
Use Respectful, Bias-Free Language. The APA manual outlines important concerning avoiding bias with respect to gender, race, disabilities, and so forth. When discussing different racial groups, make sure that your terms are parallel. When possible, avoid the generic pronouns he and she, or he/she by using they.
http://academicguides.waldenu.edu/writingcenter/apa/other
APA style is so much more than citations and references. Walden follows every aspect of the Publication Manual and some of the most common elements are listed here. These elements are often topics of blog posts, webinars, and tweets from our Twitter account.
http://academicguides.waldenu.edu/writingcenter/apa/other
7. Use a comma near the end of a sentence to separate contrasted coordinate elements or to indicate a distinct pause or shift. 8. Use commas to set off phrases at the end of the sentence that refer back to the beginning or middle of the sentence.
https://owl.english.purdue.edu/owl/resource/607/01/
Lists (Seriation) Seriation refers to how to list information. Within a paragraph, list items that must appear in a certain order using (a), (b), and (c). If you do not need to imply a particular order, then remove the letters and/or use bullet points.
http://academicguides.waldenu.edu/writingcenter/apa/other
when to use a comma in apa format
A comma separates the year of publication and the page number.