Não informado. (1979). Educational communication and technology. Association for Educational Communications and Technology.
Citação do estilo Chicago (17ª ed.)Não informado. Educational Communication and Technology. Washington: Association for Educational Communications and Technology, 1979.
Citação MLA (8ª ed.)Não informado. Educational Communication and Technology. Association for Educational Communications and Technology, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.