Não informado. (2001). Philippine Agriculturist. University of the Philippines, College of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Philippine Agriculturist. Los Banos, Filipinas: University of the Philippines, College of Agriculture, 2001.
MLA-referens (8:e uppl.)Não informado. Philippine Agriculturist. University of the Philippines, College of Agriculture, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.