Levine, M., & Perkins, D. V. (1997). Principles of community psychology: Perspectives and applications (2nd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Levine, Murray, agus David V. Perkins. Principles of Community Psychology: Perspectives and Applications. 2nd ed. New York: Oxford University Press, 1997.
Lua MLA (9ú heag.)Levine, Murray, agus David V. Perkins. Principles of Community Psychology: Perspectives and Applications. 2nd ed. Oxford University Press, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.