APA (7th ed.) Citation

O'Shaughnessy, J. (1990). Why people buy. Oxford University Press.

Chicago Style (17th ed.) Citation

O'Shaughnessy, John. Why People Buy. New York, Oxford: Oxford University Press, 1990.

MLA (9th ed.) Citation

O'Shaughnessy, John. Why People Buy. Oxford University Press, 1990.

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