Williamson, J. L. (1955). A survey of police services and problems in the Philippines. Institute of Public Administration, University of the Philippines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliamson, Jeter L. A Survey of Police Services and Problems in the Philippines. Manila: Institute of Public Administration, University of the Philippines, 1955.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilliamson, Jeter L. A Survey of Police Services and Problems in the Philippines. Institute of Public Administration, University of the Philippines, 1955.
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