how to reference a quote from a book

On your references page, you will only list the source you actually read: in this case, Chan.

“Quote” (Nguyen, 1999, as cited in Chan, 2002, p. 487)

As with most secondary referencing this is to be discouraged as far as possible. It isn’t considered to be very good academic practice. You should always aim to refer to the original publications if you can.
Advice from the OSCOLA guide:
If it is not possible to find the original source, cite the source as cited in the secondary source then in brackets put ‘as cited in’ then cite the secondary source including the page number. For example:

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.

Enclose the quoted statement in double quotation marks to reference in-text. If the eBook has no page numbers, use one of the following:

1. Use paragraph number if numbering is shown in the original.
   For example, (Smith, 2016, para. 87)
2. Count the paragraphs from the heading to the paragraph containing your quoted statement to provide a paragraph number.
   For example: (Smith, 2016, Introduction section, para. 3)
3. If there are no paragraph numbers in the source, provide the heading of the section where your quoted words belong
4. If headings are too long, provide the few first words as a shortened section title but enclose it in double quotation marks.
   For example: (Smith, 2016, “The Alternatives to the Standard,” para. 4).

In the list of references, record the publication you actually sourced.
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.

References:

http://libanswers.brunel.ac.uk/faq/48876
http://www.wur.nl/en/article/How-do-I-cite-a-source-I-found-in-another-source.htm
http://studenthelp.secure.griffith.edu.au/app/answers/detail/a_id/2881/~/how-do-i-reference-a-direct-quote-from-an-ebook-in-apa-when-there-are-no-page
http://libguides.scu.edu.au/harvard/secondary-sources
http://www.merriam-webster.com/thesaurus/referenced