Gordon, W. C. (1989). Learning and memory. Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Gordon, William C. Learning and Memory. Pacific Grove, Calif: Brooks/Cole, 1989.
Lua MLA (9ú heag.)Gordon, William C. Learning and Memory. Brooks/Cole, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.