Okoro, E. B. (1980). Factors associated with the performance of irrigation associations in the Pila Social Laboratory [microform]. Photoduplication Service. University of the Philippines Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOkoro, Emmanuel B. Factors Associated with the Performance of Irrigation Associations in the Pila Social Laboratory [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOkoro, Emmanuel B. Factors Associated with the Performance of Irrigation Associations in the Pila Social Laboratory [microform]. Photoduplication Service. University of the Philippines Library, 1980.
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