South Africa. Dept. of Agricultural Technical Services. (1974). Extension research in the Republic of South Africa: Summaries of research projects completed in the Department of Agrarian Extension of the University of Pretoria 1959-1972. Department of Agricultural Technical Services.
Chicago Style (17. basım) AtıfSouth Africa. Dept. of Agricultural Technical Services. Extension Research in the Republic of South Africa: Summaries of Research Projects Completed in the Department of Agrarian Extension of the University of Pretoria 1959-1972. Pretoria: Department of Agricultural Technical Services, 1974.
MLA (8th ed.) AtıfSouth Africa. Dept. of Agricultural Technical Services. Extension Research in the Republic of South Africa: Summaries of Research Projects Completed in the Department of Agrarian Extension of the University of Pretoria 1959-1972. Department of Agricultural Technical Services, 1974.