Here's the information about secondary references from UTS Library's Harvard UTS Referencing Guide: https://www.lib.uts.edu.au/help/referencing/harvard-uts-referencing-guide/more-information [9] 

Quote from a work citing another author

Sometimes a work you are using quotes a work from another author. For example, on page 78 of a book by Thorne, written in 1994, you find a quote from a 1906 paper by Albert Einstein. To cite the work by Einstein you should mention Einstein's paper in the text and use Thorne as your in-text reference, with page number:

Einstein stated in 1906 that time is relative (Thorne 1994, p. 78).

An alternative way of writing this is (you should choose whichever you think works best for you):

Einstein (1906, cited in Thorne 1994, p. 78) stated that time is relative.

In your reference list you must have the full reference for Thorne. If you wish, you may also include the reference for Einstein (you can get this from Thorne's bibliography), but this isn't necessary because you haven't actually consulted the Einstein paper directly.

Inception reference.