Citing secondary sources in APA style
However, if you cannot find the original source, you should cite it through the secondary source that led you to it, using the phrase “as cited in”. This is sometimes called citing indirectly.
Citing indirectly using “as cited in”
To cite indirectly, include both authors in the in-text citation. Note the author and date of the original source first, followed by “as cited in” and the source where you found it.
If you do not know the publication date of the original source, you can omit this and include only the date of the secondary source.
Secondary sources in the reference list
On the reference page, list only the source that you actually consulted (not the original source that you could not track down). In the above example, this would mean including Swaen’s book (but not Driessen’s).
|Template||Author Last Name, Initials. (Year). Book Title (edition). City, State/Country: Publisher.|
|Example||Swaen, B. R. M. (2014). Startup Scribbr. New York, NY: Free Press.|