This is called secondary referencing.
Let’s say you have read a book published in 2012 and the author is O'Sullivan. It mentions and references a good point by someone called Muller.
You can only reference what you have read (the book by O'Sullivan). You must make the situation clear in your text:
Muller (2003, cited in O'Sullivan, 2012) notes that referencing can be fun.
If you are using a direct quote don’t forget a page number:
Muller (2003, cited in O'Sullivan, 2012, p. 23) argues that “referencing is the most fun you can ever have”.
In your reference list you must include a full reference for the item you have read - the book by O'Sullivan:
O'Sullivan, J. (2012) Referencing and the meaning of life. Aberdeen: Library University Press.
You do NOT include a reference for Muller as you have not read the item by Muller - you are relying on what O'Sullivan has told you Muller has said.
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