National Education Association of the United States. Dept. of Audiovisual Instruction & Norberg, K. D. (1962). Perception theory and AV education. Department of Audiovisual Instruction.
Dyfyniad Arddull ChicagoNational Education Association of the United States. Dept. of Audiovisual Instruction and Kenneth Delbert Norberg. Perception Theory and AV Education. Washington, D.C.: Department of Audiovisual Instruction, 1962.
Dyfyniad MLANational Education Association of the United States. Dept. of Audiovisual Instruction and Kenneth Delbert Norberg. Perception Theory and AV Education. Department of Audiovisual Instruction, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.