MLA

Cantwell, John D. The Second World War : a Guide to Documents In the Public Record Office. Rev. 3rd ed. Richmond: PRO, 1998.

APA

Cantwell, J. D. (1998). The second world war : a guide to documents in the Public Record Office. Rev. 3rd ed. Richmond: PRO.

Chicago

Cantwell, John D. The Second World War: A Guide to Documents In the Public Record Office. Rev. 3rd ed. Richmond: PRO, 1998.