Gaya APA

Napier, R, W., Gershenfeld, M, K. (1979). Making groups work : a guide for group leaders . New York: Houghton Mifflin.

Gaya MLA

Napier, Rodney, W.., Gershenfeld, Matti, K.. "Making groups work : a guide for group leaders". New York: Houghton Mifflin, 1979. Text.