1. AAFC-OMAF (1994). Best Management Practices—Livestock and Poultry Waste Management. Booklet 2. Best Management Practices Project. Agriculture and Agri-food Canada and Ontario Ministry of Agriculture and Food. Guelph, Ontario, Canada
2. ASAE (2000). Agricultural machinery management data. ASAE Standards 2000: EP496.2 P 344–349 and D297.4. P 213–220. ASAE, St. Joseph, MI
3. ASAE (1982/84). Agricultural machinery management data. Agricultural Engineering Yearbook, 1982 and 1984. P 213–220. ASAE D230.3&4 ASAE, St. Joseph, MI
4. ASAE (1971). Agricultural machinery management data. Agricultural Engineering Yearbook, 1971, pp 287–294. ASAE D230.2 ASAE, St. Joseph, MI
5. Agriculture Canada (1991). Handbook of Selected Agricultural Statistics 1990. Policy Branch, Agriculture and Agri-food Canada. Ottawa, ON. Lib no. 630.971 C212