APA (7th ed.) Citation

National Portrait Gallery. (1936). Guide to the National Portrait Gallery. O.U.P. and N.P.G.

Chicago Style (17th ed.) Citation

National Portrait Gallery. Guide to the National Portrait Gallery. London: O.U.P. and N.P.G, 1936.

MLA (9th ed.) Citation

National Portrait Gallery. Guide to the National Portrait Gallery. O.U.P. and N.P.G, 1936.

Warning: These citations may not always be 100% accurate.