Gall, M. D. (1981). Handbook for evaluating and selecting curriculum materials. Allyn and Bacon.
Citazione stile Chigago Style (17a edizione)Gall, Meredith D. Handbook for Evaluating and Selecting Curriculum Materials. Boston: Allyn and Bacon, 1981.
Citatione MLA (9a ed.)Gall, Meredith D. Handbook for Evaluating and Selecting Curriculum Materials. Allyn and Bacon, 1981.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.