Smith, H. R., & Nagle, T. S. (1972). Instructional media in the learning process. C. E. Merrill Pub. Co..

Smith, Hayden Richard, and Thomas S. Nagle. Instructional Media in the Learning Process. Columbus, Ohio: C. E. Merrill Pub. Co., 1972.

Smith, Hayden Richard, and Thomas S. Nagle. Instructional Media in the Learning Process. C. E. Merrill Pub. Co., 1972.