Gray, J. C., & Gray, R. (1963). The nature and sources of the law (Second edition from the author's notes.). Beacon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGray, John Chipman, और Roland Gray. The Nature and Sources of the Law. Second edition from the author's notes. Boston: Beacon Press, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGray, John Chipman, और Roland Gray. The Nature and Sources of the Law. Second edition from the author's notes. Beacon Press, 1963.
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