APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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