Galvante, W. P., Magalong, M. M., & Mencias, C. F. (1977). A content analysis of Environmental Science I [microform]. Photoduplication Service. University of the Philippines Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGalvante, Wulfilda P., Milagrosa M. Magalong, और Cristina F. Mencias. A Content Analysis of Environmental Science I [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGalvante, Wulfilda P., et al. A Content Analysis of Environmental Science I [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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