Egan, G. (1990). The skilled helper: A systematic approach to effective helping (4th ed.). Brooks / Cole.
Chicagoスタイル(17版)引用形式Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. California: Brooks / Cole, 1990.
MLA(9版)引用形式Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. Brooks / Cole, 1990.
警告: この引用は必ずしも正確ではありません.