Prabowo, T. (1978). The educational effects on farmers of the pilot extension program on direct seeding of rainfed rice in Bulacan province, Philippines [microform]. Photoduplication Service. University of the Philippines Library.
Παραπομπή σε μορφή Chicago (17η εκδ.)Prabowo, Tjitropranoto. The Educational Effects on Farmers of the Pilot Extension Program on Direct Seeding of Rainfed Rice in Bulacan Province, Philippines [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1978.
Παραπομπή σε μορφή MLA (9th εκδ.)Prabowo, Tjitropranoto. The Educational Effects on Farmers of the Pilot Extension Program on Direct Seeding of Rainfed Rice in Bulacan Province, Philippines [microform]. Photoduplication Service. University of the Philippines Library, 1978.