APA-Zitierstil (7. Ausg.)

RIES, A. (1991). Harse sense: The key to success is.. McGraw-Hill.

Chicago-Zitierstil (17. Ausg.)

RIES, Al. Harse Sense: The Key to Success Is.. New York: McGraw-Hill, 1991.

MLA-Zitierstil (9. Ausg.)

RIES, Al. Harse Sense: The Key to Success Is.. McGraw-Hill, 1991.