Williamson, J. L. (1955). A survey of police services and problems in the Philippines. Institute of Public Administration, University of the Philippines.
Chicago-referens (17:e uppl.)Williamson, Jeter L. A Survey of Police Services and Problems in the Philippines. Manila: Institute of Public Administration, University of the Philippines, 1955.
MLA-referens (9:e uppl.)Williamson, Jeter L. A Survey of Police Services and Problems in the Philippines. Institute of Public Administration, University of the Philippines, 1955.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.