APA (7th ed.) Citation

Southern, J. F., Daintith, J., & Nelson, R. D. (1989). The Penguin dictionary of mathematics. Penguin Books.

Chicago Style (17th ed.) Citation

Southern, Jane Farrill, J. Daintith, and R. D. Nelson. The Penguin Dictionary of Mathematics. London: Penguin Books, 1989.

MLA (9th ed.) Citation

Southern, Jane Farrill, et al. The Penguin Dictionary of Mathematics. Penguin Books, 1989.