Cobb, B. (1956). Critical years at the Yard; the career of Frederick Williamson of the Detective Department and the C.I.D. Faber and Faber.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCobb, Belton. Critical Years at the Yard; the Career of Frederick Williamson of the Detective Department and the C.I.D. London: Faber and Faber, 1956.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCobb, Belton. Critical Years at the Yard; the Career of Frederick Williamson of the Detective Department and the C.I.D. Faber and Faber, 1956.
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