Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: D08686
Notes:
Pages 43-66 in William Ascher and John M. Heffron (eds.), Cultural change and persistence: new perspectives on development. Palgrave McMillan, New YorkCity, New York. 263 pages.
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: C19155
Notes:
Pages 111-170 in U.S. Department of Agriculture, "Farmers in a changing world," 1940 Yearbook of Agriculture, U.S.Government Printing Office, Washington, D.C. 1,215 pages.