1. Comparison of energy use patterns in Maiduguri and yoke flour mills Nigeria;Abubakar;The CIGR Journal of Scientific Research and Development, Agricultural Engineering International,2006
2. Análise energética de sistemas de produção de soja convencional e orgânica;Assenheimer;Revista do Setor de Ciências Agrárias e Ambientais,2009
3. Materials-process-product model;Ayres,1974
4. Máquinas agrícolas;Balastreire,1987
5. The production and consumption of automobiles. An energy analysis of the manufacture, discard and reuse of the automobile and its component materials;Berry,1972