Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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