Thasanasongchan, A. (1977). Methods, sources and time of nitrogen application for upland rice [microform]. Photoduplication Service, University of the Philippines Library.
Chicago-referens (17:e uppl.)Thasanasongchan, Akwut. Methods, Sources and Time of Nitrogen Application for Upland Rice [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
MLA-referens (9:e uppl.)Thasanasongchan, Akwut. Methods, Sources and Time of Nitrogen Application for Upland Rice [microform]. Photoduplication Service, University of the Philippines Library, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.