Footnotes
- Niven , Harold . 1971 . Radio‐Television Programs in American Colleges and Universities: Twelfth Report, 1969‐70 , Washington, D. C : National Association of Broadcasters .
- Erdos , Paul L. 1970 . Professional Mail Surveys , New York : McGraw‐Hill .
- Niven's , Harold . 1972 . Radio‐Television Programs in American Colleges and Universities: Thirteenth Report, 1971‐72 , Washington, D. C : National Association of Broadcasters .