Okafor, L. I. (1977). Perennial nutsedge (Cyperus rotundus L.) competition with upland rice and its chemical control [microform]. Photoduplication Service, University of the Philippines Library.
Čikaški stil citiranja (17. izdanje)Okafor, Lewis Ikechukwa. Perennial Nutsedge (Cyperus Rotundus L.) Competition with Upland Rice and Its Chemical Control [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
MLA način citiranja (9. izdanje)Okafor, Lewis Ikechukwa. Perennial Nutsedge (Cyperus Rotundus L.) Competition with Upland Rice and Its Chemical Control [microform]. Photoduplication Service, University of the Philippines Library, 1977.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.