APA style requires that you include an in-text citation every time you summarize, paraphrase, or quote another source. For every in-text citation in your paper, there must be a corresponding entry in your reference list.
When summarizing or paraphrasing, use the author and date of publication. When providing a direct quote, you must also include the page number.
Students often had difficulty using APA style, especially when it was their first time citing sources. This difficulty could be attributed to the fact that many students failed to purchase a style manual or to ask their teacher for help. (p. 199)