Não informado. (1977). Core: Collected original resources in education. Carfax Publishing.
Style de citation Chicago (17e éd.)Não informado. Core: Collected Original Resources in Education. Oxford, Inglaterra: Carfax Publishing, 1977.
Style de citation MLA (8e éd.)Não informado. Core: Collected Original Resources in Education. Carfax Publishing, 1977.
Attention : ces citations peuvent ne pas être correctes à 100%.