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 in the bibliography.  

Author-Date:

In text citation:

(Author Surname Year: page)

Example:

(García Márquez 2007: 143)

Entry in a bibliography:

Surname, First name Year Title, trans. by First name Surname of translator (Publisher)

Example:

García Márquez, Gabriel. 2007. One hundred years of solitude trans. by Gregory Rabassa (Penguin)

Include the Author and the Translator names in the Bibliography entry.  The translators name comes after the title, use the abbreviation trans. and use the format First Name Surname for the translator.