Gorman, R. M. (1972). Discovering Piaget: A guide for teachers. Merrill.
Lua i Stíl Chicago (17ú heag.)Gorman, Richard M. Discovering Piaget: A Guide for Teachers. Columbus, Ohio: Merrill, 1972.
Lua MLA (8ú heag.)Gorman, Richard M. Discovering Piaget: A Guide for Teachers. Merrill, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.