APA (7th ed.) Citation

Greif, G. L. (2012). Two plus two: Couples and their couple friendships. Routledge.

Chicago Style (17th ed.) Citation

Greif, Geoffrey L. Two Plus Two: Couples and Their Couple Friendships. New York: Routledge, 2012.

MLA (9th ed.) Citation

Greif, Geoffrey L. Two Plus Two: Couples and Their Couple Friendships. Routledge, 2012.