Answered By: Linda Kern Last Updated: Dec 12, 2016 Views: 429
According to the APA Publication Manual 6th edition, section 6.04, p. 171, "When paraphrasing or referring to an idea contained in another work, you are encouraged to provide a page or paragraph number, especially when it would help an interested reader locate the relevant passage in a long or complex text." The Manual is the authoritative reference.
As you can see, this is a gray area. I recommend adding the page number when paraphrasing just to be on the safe side.