Bondad, A. A. (1979). Effects of foliar sprays of urea on the growth of calamandarin seedlings [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-referens (17:e uppl.)Bondad, Angelina Ang. Effects of Foliar Sprays of Urea on the Growth of Calamandarin Seedlings [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1979.
MLA-referens (9:e uppl.)Bondad, Angelina Ang. Effects of Foliar Sprays of Urea on the Growth of Calamandarin Seedlings [microform]. Photoduplication Service. University of the Philippines Library, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.