Guillermo, R. G. (2011). The problem of Indio inferiority in science: Rizal's two views. Philippine Studies: Historical and Ethnographic Viewpoints.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGuillermo, Ramon G. "The Problem of Indio Inferiority in Science: Rizal's Two Views." Philippine Studies: Historical and Ethnographic Viewpoints 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGuillermo, Ramon G. "The Problem of Indio Inferiority in Science: Rizal's Two Views." Philippine Studies: Historical and Ethnographic Viewpoints, 2011.
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