APA (7th ed.) Citation

Parry, H. B. (1974). Population and its problems: A plain man's guide. Clarendon Press.

Chicago Style (17th ed.) Citation

Parry, H. B. Population and Its Problems: A Plain Man's Guide. Oxford [England]: Clarendon Press, 1974.

MLA (9th ed.) Citation

Parry, H. B. Population and Its Problems: A Plain Man's Guide. Clarendon Press, 1974.