Cita APA (7th ed.)

Napier, R. W., & Gershenfeld, M. K. (1989). Groups: Theory and experience (4th ed.). Houghton Mifflin.

Cita Chicago (17th ed.)

Napier, Rodney W., i Matti K. Gershenfeld. Groups: Theory and Experience. 4th ed. Boston: Houghton Mifflin, 1989.

Cita MLA (9th ed.)

Napier, Rodney W., i Matti K. Gershenfeld. Groups: Theory and Experience. 4th ed. Houghton Mifflin, 1989.