Cita APA (7th ed.)
Carkhuff, R. R. (1983). The student workbook for the art of helping. Human Resource Development Press.
Cita Chicago (17th ed.)
Carkhuff, Robert R. The Student Workbook for the Art of Helping. Amherst, Massachuttes: Human Resource Development Press, 1983.
Cita MLA (9th ed.)
Carkhuff, Robert R. The Student Workbook for the Art of Helping. Human Resource Development Press, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.