A republished book is one that has gone out of print and subsequently been republished—usually by a different publisher and sometimes as part of an anthology.
When referencing a republished book, include the original date of publication at the end of the reference list entry. In-text citations should include both the republished and original publication dates (e.g., 1968/2012).
For example:
Author, A. (Republication date). Title of book in italic sentence case (ed. &/or Vol.). Publisher. (Original publication date)
Russell, B. (1998). The problems of philosophy (2nd ed.). Oxford University Press. (Original work published 1912)
Examples
Reference list entry
Russell, B. (1998). The problems of philosophy (2nd ed.). Oxford University Press. (Original work published 1912)
In-text citations
Page/paragraph numbers are optional for paraphrased information.
Narrative
Russell (1912/1998) suggests ... (p. 63).
Parenthetical
... (Russell, 1912/1998, p. 63).