Graff, E. J. (2004). What is marriage for? Beacon Press.
Chicago Style aipamenaGraff, E. J. What Is Marriage for? Boston: Beacon Press, 2004.
MLA aipamenaGraff, E. J. What Is Marriage for? Beacon Press, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.