Cita APA (7a ed.)

Crampton, W. G. (1979). The observer's book of flags: William G. Crampton (New ed.). Warne.

Cita Chicago Style (17a ed.)

Crampton, William G. The Observer's Book of Flags: William G. Crampton. New ed. London: Warne, 1979.

Cita MLA (8a ed.)

Crampton, William G. The Observer's Book of Flags: William G. Crampton. New ed. Warne, 1979.