APA (7th ed.) Citation

Campbell, G., & Evans, I. (1957). The Book of Flags: Third Edition. Oxford University Press.

Chicago Style (17th ed.) Citation

Campbell, Gordon, and I.O Evans. The Book of Flags: Third Edition. London: Oxford University Press, 1957.

MLA (9th ed.) Citation

Campbell, Gordon, and I.O Evans. The Book of Flags: Third Edition. Oxford University Press, 1957.