Asimov, I. (2010). Foundation: Foundation and empire ; Second foundation. Everymans Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAsimov, Isaac. Foundation: Foundation and Empire ; Second Foundation. New York: Everymans Library, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAsimov, Isaac. Foundation: Foundation and Empire ; Second Foundation. Everymans Library, 2010.
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