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.
Čikaški stil citiranja (17. izdanje)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.
MLA način citiranja (9. izdanje)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.
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