DIRECTOR, S. W. (1972). Introduction To Systems Theory Tephen W. Director. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDIRECTOR, Stephen W. Introduction To Systems Theory Tephen W. Director. McGraw-Hill, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDIRECTOR, Stephen W. Introduction To Systems Theory Tephen W. Director. McGraw-Hill, 1972.
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