National Society for the Study of Education (U.S.). Committee on Audio-visual Materials of Instruction & Henry, N. B. (1949). Audio-visual materials of instruction. National Society for the Study of Education : Distributed by University of Chicago Press.
Citace podle Chicago (17th ed.)National Society for the Study of Education (U.S.). Committee on Audio-visual Materials of Instruction a Nelson B. Henry. Audio-visual Materials of Instruction. Chicago: National Society for the Study of Education : Distributed by University of Chicago Press, 1949.
Citace podle MLA (8th ed.)National Society for the Study of Education (U.S.). Committee on Audio-visual Materials of Instruction a Nelson B. Henry. Audio-visual Materials of Instruction. National Society for the Study of Education : Distributed by University of Chicago Press, 1949.