Não informado. (1956). Instructional materials. National Education Association, Department of Audio Visual Instruction.
Style de citation Chicago (17e éd.)Não informado. Instructional Materials. Washington: National Education Association, Department of Audio Visual Instruction, 1956.
Style de citation MLA (8e éd.)Não informado. Instructional Materials. National Education Association, Department of Audio Visual Instruction, 1956.
Attention : ces citations peuvent ne pas être correctes à 100%.