Secondary sources

APA discourages the use of secondary sources unless the original work is unavailable. If you read an article or book which references some information that you also want to reference and you have been unable to locate the original source, cite the source you have read in the Reference list; in text, name the original work and give the citation for the source where you found the information.  Where the year of publication for the original work is known, include it. For example:

Sue reads an article by Chris Brown in the Journal of Library Administration in which he cites or refers to statements made by Ulrich Boser in his 2017 book ‘Learn Better’. Sue wants to refer to Boser’s statement in her assignment.

Sue would acknowledge Boser in her text but her reference is to the source where she saw the information. Sue might write as her in-text reference:

... (Boser, 2017, as cited in Brown, 2018)
                        OR 
Boser (2017, as cited in Brown, 2018) states ...

In her reference list Sue would write a reference for Brown's article because that's where she sourced the information. The entry in her References would be:

Brown, C. (2018). Creating better learners through learning science: A sample of methods. Journal of Library Administration, 58(4), 375-

381. https://doi.org/10.1080/01930826.2018.1448652