(1988). Agricultural extension: Guidelines for extension workers in rural areas. St. Gallen, Switzerland: Swiss Centre for Development Cooperation in Technology and Management.
Chicago Style aipamenaAgricultural Extension: Guidelines for Extension Workers in Rural Areas. St. Gallen, Switzerland: Swiss Centre for Development Cooperation in Technology and Management, 1988.
MLA aipamenaAgricultural Extension: Guidelines for Extension Workers in Rural Areas. St. Gallen, Switzerland: Swiss Centre for Development Cooperation in Technology and Management, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.