Smith, H. R., & Nagle, T. S. (1972). Instructional media in the learning process. C. E. Merrill Pub. Co..
Lua i Stíl Chicago (17ú heag.)Smith, Hayden Richard, agus Thomas S. Nagle. Instructional Media in the Learning Process. Columbus, Ohio: C. E. Merrill Pub. Co., 1972.
Lua MLA (8ú heag.)Smith, Hayden Richard, agus Thomas S. Nagle. Instructional Media in the Learning Process. C. E. Merrill Pub. Co., 1972.
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