Pages 68-69 in Review of Extension Research, January through December 1957. Summary of a thesis for the Master of Science degree at the University of Illinois, Urbana. 95 pages. 1956.
Pages 79-80 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Summary of research, Communications Research Center, Michigan State University, East Lansing. 1958. 57 pages.