Citazione Stile APA (7a Edizione)
Egan, G. (1990). The skilled helper: A systematic approach to effective helping (4th ed.). Brooks / Cole.
Citazione stile Chigago Style (17a edizione)
Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. California: Brooks / Cole, 1990.
Citatione MLA (9a ed.)
Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. Brooks / Cole, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.