In your research, an author may refer to another researcher's work, or one author quotes from another's work.

 An indirect citation is when the ideas of one author are published in another author's text but you have not read or accessed the original author's work.

This is generally discouraged because authors are expected to have examined the works they cite. Always try and find the original work before indirectly citing it.

This source within a source is known as an 'indirect source'. If you can't access the original source, make it clear in the text of your document that you are quoting a secondary source.

In the same reference list entry, provide the details of both the work in which you found the quotation or idea, and the actual source. Do not cite the primary source as a separate entry - only items actually consulted should be listed. 

The 10th edition of the AMA Manual section 3.13.10 states:

Reference may be made to one author’s citation of, or quotation from, another’s work. Distinguish between citation (work mentioned) and quotation (words actually quoted). In the text, the name of the original author, rather than the secondary source, should be mentioned. (See also 3.11.12, References to Print Journals, Discussants)..... citation of the original document is preferred unless it is not readily available.  

The forms for listed references are as follows:
 

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