National Education Association of the United States, Frazier, A., & Wigren, H. E. (1960). Opportunities for learning : guidelines for television: A report of a seminar held at NEA headquarters, May 16-18, 1959. Division of Audio-Visual Instructional Service, National Education Association of the United States.
Chicago-viite (17. p.)National Education Association of the United States, Alexander Frazier, ja Harold E. Wigren. Opportunities for Learning : Guidelines for Television: A Report of a Seminar Held at NEA Headquarters, May 16-18, 1959. Washington, D.C: Division of Audio-Visual Instructional Service, National Education Association of the United States, 1960.
MLA-viite (9. p.)National Education Association of the United States, et al. Opportunities for Learning : Guidelines for Television: A Report of a Seminar Held at NEA Headquarters, May 16-18, 1959. Division of Audio-Visual Instructional Service, National Education Association of the United States, 1960.