Lua APA (7ú heag.)

Gulley, H. E. (1968). Discussion, conference, and group process (2nd ed.). Holt, Rinehart and Winston.

Lua i Stíl Chicago (17ú heag.)

Gulley, Halbert E. Discussion, Conference, and Group Process. 2nd ed. New York: Holt, Rinehart and Winston, 1968.

Lua MLA (9ú heag.)

Gulley, Halbert E. Discussion, Conference, and Group Process. 2nd ed. Holt, Rinehart and Winston, 1968.

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