Q. How do you cite a book that is a translation using MLA style?

The basic format according to MLA format (8th edition) for a translated book is:

Author's Last Name, First Name. Title of Book. Translated by First Name Last Name.
     Publisher, Year.

Example:

Hammesfahr, Petra. The Sinner. Translated by John Brownjohn. Bitter Lemon Press, 2007.