Castillo, L. L. (1980). The effects of extension and technical knowledge on farmer productivity in Nueva Ecija, Philippines [microform]. Photoduplication Service. University of the Philippines Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCastillo, Linda Lao. The Effects of Extension and Technical Knowledge on Farmer Productivity in Nueva Ecija, Philippines [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCastillo, Linda Lao. The Effects of Extension and Technical Knowledge on Farmer Productivity in Nueva Ecija, Philippines [microform]. Photoduplication Service. University of the Philippines Library, 1980.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.