Spencer, J. C. (1954). Crime And The Services / John C. Spencer. Routledge r Kegan Paul LTD.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpencer, John C. Crime And The Services / John C. Spencer. Routledge r Kegan Paul LTD, 1954.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpencer, John C. Crime And The Services / John C. Spencer. Routledge r Kegan Paul LTD, 1954.
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