Citazione Stile APA (7a Edizione)

Carkhuff, R. R. (1983). The art of helping (5th ed.). Human Resource Development Press.

Citazione stile Chigago Style (17a edizione)

Carkhuff, Robert R. The Art of Helping. 5th ed. Amherst, Mass: Human Resource Development Press, 1983.

Citatione MLA (9a ed.)

Carkhuff, Robert R. The Art of Helping. 5th ed. Human Resource Development Press, 1983.