Lerch, D. G. (1960). Dissemination of farm information through newspapers, magazines, radio and television; a story of the service in the United States, including how they developed, function, and are financed. International Cooperation Administration.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Lerch, Donald G. Dissemination of Farm Information Through Newspapers, Magazines, Radio and Television; a Story of the Service in the United States, Including How They Developed, Function, and Are Financed. Washington: International Cooperation Administration, 1960.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Lerch, Donald G. Dissemination of Farm Information Through Newspapers, Magazines, Radio and Television; a Story of the Service in the United States, Including How They Developed, Function, and Are Financed. International Cooperation Administration, 1960.