Ripley, H. (1983). Police Forces of Great Britan and Ireland: Their amalgamations and their buttons / by Howard Ripley. Hazel.
Lua i Stíl Chicago (17ú heag.)Ripley, Howard. Police Forces of Great Britan and Ireland: Their Amalgamations and Their Buttons / by Howard Ripley. Oxfordshire: Hazel, 1983.
Lua MLA (8ú heag.)Ripley, Howard. Police Forces of Great Britan and Ireland: Their Amalgamations and Their Buttons / by Howard Ripley. Hazel, 1983.
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