Martin, G. (1968). General metaphysics: Its problems and its method. Allen & Unwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMartin, Gottfried. General Metaphysics: Its Problems and Its Method. Allen & Unwin, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMartin, Gottfried. General Metaphysics: Its Problems and Its Method. Allen & Unwin, 1968.
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