APA (7th ed.) Citation

Gray. (2012). Men are from Mars, women are from Venus: The definitive guide to relationships. Harper Element.

Chicago Style (17th ed.) Citation

Gray. Men Are from Mars, Women Are from Venus: The Definitive Guide to Relationships. London: Harper Element, 2012.

MLA (8th ed.) Citation

Gray. Men Are from Mars, Women Are from Venus: The Definitive Guide to Relationships. Harper Element, 2012.