Wilkinson, P., & Ingpen, R. (1994). People who changed the world. Chelsea House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilkinson, Philip, और Robert Ingpen. People Who Changed the World. New York: Chelsea House, 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilkinson, Philip, और Robert Ingpen. People Who Changed the World. Chelsea House, 1994.
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