Where a work has an original author or editor and has been translated, you need to include the details of the Author/Editor and the Translator.  You include details of the Translator in the Reference List only.

In-text citation: (Author Year, Page)

Example:

(Zhmud 2012, 118)

Reference List: Surname, First Name. Year. Title. Translated by First Name Surname. Place: Publisher.

Example:

Zhmud, Leonid. 2012. Pythagoras and the Early Pythagoreans. Translated by Kevin Winder, and Rosh Ireland. Oxford: Oxford University Press.

Note that the Translator(s) name is given as First Name Surname.