Belcher, D. M. (1973). Giving psychology away. Canfield Press.
Lua i Stíl Chicago (17ú heag.)Belcher, Duane M. Giving Psychology Away. San Francisco: Canfield Press, 1973.
Lua MLA (9ú heag.)Belcher, Duane M. Giving Psychology Away. Canfield Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.