Pretty, J. N. (1988). Preference ranking. Northeast Rainfed Agricultural Development (NERAD) Project, Northeast Regional Office of Agriculture.
Chicago-referens (17:e uppl.)Pretty, Jules N. Preference Ranking. Khon Kaen, Thailand: Northeast Rainfed Agricultural Development (NERAD) Project, Northeast Regional Office of Agriculture, 1988.
MLA-referens (9:e uppl.)Pretty, Jules N. Preference Ranking. Northeast Rainfed Agricultural Development (NERAD) Project, Northeast Regional Office of Agriculture, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.