Não informado. (1956). Instructional materials. National Education Association, Department of Audio Visual Instruction.
Chicagoスタイル(17版)引用形式Não informado. Instructional Materials. Washington: National Education Association, Department of Audio Visual Instruction, 1956.
MLA(8版)引用形式Não informado. Instructional Materials. National Education Association, Department of Audio Visual Instruction, 1956.
警告: この引用は必ずしも正確ではありません.