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.
Pages 14-15 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of a master's report for the master of education degree in extension education, Colorado State University, Ft. Collins. 1961. 115 pages.