APA (7e ed.) Bronvermelding

Não informado. (1956). Instructional materials. National Education Association, Department of Audio Visual Instruction.

Chicago (17e ed.) Bronvermelding

Não informado. Instructional Materials. Washington: National Education Association, Department of Audio Visual Instruction, 1956.

MLA (8e ed.) Bronvermelding

Não informado. Instructional Materials. National Education Association, Department of Audio Visual Instruction, 1956.

Let op: Deze citaties zijn niet altijd 100% accuraat.