APA Style

Office, U, K, H. (2001). Catalogue of Admiralty Charts and Publications (NP131) (2001 Editions). London: United Kingdom Hydrographic Office.

MLA Style

Office, United, Kingdom, Hydrographic. "Catalogue of Admiralty Charts and Publications (NP131)". 2001 Editions London: United Kingdom Hydrographic Office, 2001. Text.