Cita APA (7th ed.)

Duffy, K. G. (1999). Personal growth and behavior 99/00 (19th ed.). Dushkin/Mcgraw-Hill.

Cita Chicago (17th ed.)

Duffy, Karen G. Personal Growth and Behavior 99/00. 19th ed. Guilford, Conn: Dushkin/Mcgraw-Hill, 1999.

Cita MLA (9th ed.)

Duffy, Karen G. Personal Growth and Behavior 99/00. 19th ed. Dushkin/Mcgraw-Hill, 1999.