Feynman, R. P., Leighton, R. B., Sands, M. L., & Penrose, R. (2011). Six not-so-easy pieces: Einstein's relativity, symmetry, and space-time. Basic Books/Perseus Books Group.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFeynman, Richard P., Robert B. Leighton, Matthew L. Sands, और Roger Penrose. Six Not-so-easy Pieces: Einstein's Relativity, Symmetry, and Space-time. New York: Basic Books/Perseus Books Group, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFeynman, Richard P., et al. Six Not-so-easy Pieces: Einstein's Relativity, Symmetry, and Space-time. Basic Books/Perseus Books Group, 2011.
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