Napier, R., & Gershenfeld, M. K. (1981). Groups, theory and experience (2nd ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Napier, Rodney, agus Matti K. Gershenfeld. Groups, Theory and Experience. 2nd ed. Boston: Houghton Mifflin, 1981.
Lua MLA (9ú heag.)Napier, Rodney, agus Matti K. Gershenfeld. Groups, Theory and Experience. 2nd ed. Houghton Mifflin, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.