Hubbard. The Black Hole of Public Administration. University of Ottawa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHubbard. The Black Hole of Public Administration. University of Ottawa Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHubbard. The Black Hole of Public Administration. University of Ottawa Press.
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