Hartle, J. B. (2003). Gravity: An introduction to Einstein's general relativity. Pearson Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHartle, James B. Gravity: An Introduction to Einstein's General Relativity. San Francisco: Pearson Education, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHartle, James B. Gravity: An Introduction to Einstein's General Relativity. Pearson Education, 2003.
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