Tyrrell, G. W. (1929). The principles of petrology: An introduction to the science of rocks ([2nd ed.].). Methuen.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTyrrell, G. W. The Principles of Petrology: An Introduction to the Science of Rocks. [2nd ed.]. London: Methuen, 1929.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTyrrell, G. W. The Principles of Petrology: An Introduction to the Science of Rocks. [2nd ed.]. Methuen, 1929.
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