Citazione Stile APA (7a Edizione)

Egan, G. (1986). The skilled helper: A systematic approach to effective helping (3rd ed.). Brooks / Cole.

Citazione stile Chigago Style (17a edizione)

Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. California: Brooks / Cole, 1986.

Citatione MLA (9a ed.)

Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. Brooks / Cole, 1986.