Tongzon, R. C. (1976). Ang makasalanan: Nobela [microform]. Photoduplication Service, University of the Philippines Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTongzon, Raymunda C. Ang Makasalanan: Nobela [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTongzon, Raymunda C. Ang Makasalanan: Nobela [microform]. Photoduplication Service, University of the Philippines Library, 1976.
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