APA (7th ed.) Citation

Greenhill, B. (1974). Guide to the National Maritime Museum, Greenwich. [H.M.S.O.?].

Chicago Style (17th ed.) Citation

Greenhill, Basil. Guide to the National Maritime Museum, Greenwich. [London]: [H.M.S.O.?], 1974.

MLA (9th ed.) Citation

Greenhill, Basil. Guide to the National Maritime Museum, Greenwich. [H.M.S.O.?], 1974.