Cita APA (7a ed.)

Carkhuff, R. R., & Anderson, D. D. (1987). The Art of helping VI (6th. ed.). Human Resource Development Press.

Cita Chicago Style (17a ed.)

Carkhuff, Robert R., y Debra Decker Anderson. The Art of Helping VI. 6th. ed. Amherst: Human Resource Development Press, 1987.

Cita MLA (9a ed.)

Carkhuff, Robert R., y Debra Decker Anderson. The Art of Helping VI. 6th. ed. Human Resource Development Press, 1987.