Cita APA (7a ed.)

Egan, G. (1990). The skilled helper: A systematic approach to effective helping (4th ed.). Brooks / Cole.

Cita Chicago Style (17a ed.)

Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. California: Brooks / Cole, 1990.

Cita MLA (9a ed.)

Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. Brooks / Cole, 1990.