Lopez, H. E. (1977). Evolution and the satiric works of Samuel Butler: A study in influence [microform]. Photoduplication Service. University of the Philippines Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLopez, Helen Estacio. Evolution and the Satiric Works of Samuel Butler: A Study in Influence [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLopez, Helen Estacio. Evolution and the Satiric Works of Samuel Butler: A Study in Influence [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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