Riyanto. (1980). Interaction of rate and time of nitrogen application and weed control methods in upland rice [microform]. Photoduplication Service. University of the Philippines Library.
Citazione stile Chigago Style (17a edizione)Riyanto. Interaction of Rate and Time of Nitrogen Application and Weed Control Methods in Upland Rice [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1980.
Citatione MLA (9a ed.)Riyanto. Interaction of Rate and Time of Nitrogen Application and Weed Control Methods in Upland Rice [microform]. Photoduplication Service. University of the Philippines Library, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.