referencing a reference within a reference

For example, if Allport’s work is cited in Nicholson and you did not read Allport’s work, list the Nicholson reference in the reference list. In the text, use the following citation:
(adapted from the sixth edition of the APA Publication Manual , © 2010)

In your reference list you should provide the details of the secondary source (the source you read). In this example: the details of Kersten 1987.
You should always try to read and cite the original work (the primary source). If it is not possible to do this, you have to cite the original as contained in the secondary source.

Sometimes an author writes about research that someone else has done, but you are unable to track down the original research document. In this case, only include the source you did consult in your references because you did not read the original document. Use the words ‘cited in’ in the in-text citation to indicate you have not read the original research.

Example 2 Journal article

Parenthetical
In-Text Citations

References:

http://www.wur.nl/en/article/How-do-I-cite-a-source-I-found-in-another-source.htm
http://libguides.scu.edu.au/harvard/secondary-sources
http://library.purdueglobal.edu/writingcenter/apacitationforascitedin
http://www.merriam-webster.com/dictionary/reference