Citazione Stile APA (7a Edizione)
Carkhuff, R. R. (1983). The student workbook for the art of helping. Human Resource Development Press.
Citazione stile Chigago Style (17a edizione)
Carkhuff, Robert R. The Student Workbook for the Art of Helping. Amherst, Massachuttes: Human Resource Development Press, 1983.
Citatione MLA (9a ed.)
Carkhuff, Robert R. The Student Workbook for the Art of Helping. Human Resource Development Press, 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.