Duma, R. C. (1990). Technical evaluation of the UPLB-improved village rice mill in Laguna. Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos.
Lua i Stíl Chicago (17ú heag.)Duma, R. C. Technical Evaluation of the UPLB-improved Village Rice Mill in Laguna. College, Laguna: Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos, 1990.
Lua MLA (9ú heag.)Duma, R. C. Technical Evaluation of the UPLB-improved Village Rice Mill in Laguna. Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos, 1990.