I have read a book, article or webpage that has referenced something else (secondary referencing)

What should I do if I have read a book, article or webpage that has referenced or quoted a good point from another work and I would like to use that point in my essay? 

This is called secondary referencing.

Let’s say you have read a book published in 2014 and the author is Smith.  It mentions and references a good point by someone called Jones.

You can only reference what you have read (the book by Smith). You must make the situation clear in your text as follows:

Jones (as cited in Smith, 2014) notes that referencing can be fun.

If you are using a direct quote don’t forget a page number:

Jones (as cited in Smith, 2014, 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 Smith:

Smith, J. (2014). Referencing and the meaning of life. Aberdeen, Scotland: Library Press.

You do NOT include a reference for Jones as you have not read the item by Jones - you are relying on what Smith has told you Jones has said.