APA (7th ed.) Citation

Schur, N. W. (1987). A dictionary of challenging words. Penguin Group.

Chicago Style (17th ed.) Citation

Schur, Norman W. A Dictionary of Challenging Words. New York: Penguin Group, 1987.

MLA (9th ed.) Citation

Schur, Norman W. A Dictionary of Challenging Words. Penguin Group, 1987.