A classical or religious work can be cited as a book or a webpage. If citing an online version, cite as a webpage. If using a print or eBook version, cite as a book.
Sometimes an author will refer to another author's research. If the original source is relevant to your research, then you should make every effort to find it and read it. If this is not possible, then the in-text citation should include both the source that you have read and the source that you have not read, but only the source that you have actually read should be included in the references.
(Author Surname, as cited in Author Surname [of the source you read], Year)
(as cited in Author Surname [of the source you read], Year)
Author, A. A [of the source you read]. (Year). Book title: Subtitle. Publisher.
The mastery of APA increases an author's chance of scoring well on an assignment (Culver, as cited in Jones, 2009).
According to Culver (as cited in Jones, 2009), learning APA "can be tough, but like any skill, it just takes practice" (p. 23).
Note: Cite only the source you read in the reference list.
Jones, J. (2009). Scholarly writing tips. Publishing House.
...applies to the building subsurface (BC Office of Housing and Construction Standards, 2012).
BC Office of Housing and Construction Standards. (2012). BC Building Code (Division B, subsection 4.2.2). Retrieved from http://www.bccodes.ca.