Cita APA (7a ed.)
Frey, C., & Hoppe-Graff, S. (1994). Serious and playful aggression in Brazilian girls and boys. Sex Roles, 30, 249-269.
Cita Chicago Style (17a ed.)
Frey, Claudia, y Siegfried Hoppe-Graff. "Serious and Playful Aggression in Brazilian Girls and Boys." Sex Roles 30 (1994): 249-269.
Cita MLA (9a ed.)
Frey, Claudia, y Siegfried Hoppe-Graff. "Serious and Playful Aggression in Brazilian Girls and Boys." Sex Roles, vol. 30, 1994, pp. 249-269.
Precaución: Estas citas no son 100% exactas.