APA (7th ed.) Citation

Roberts, R. R., & Gallagher, J. (1999). 52 weeks of sales success: America's #1 salesman shows you how to close every deal! HarperBusiness.

Chicago Style (17th ed.) Citation

Roberts, Ralph R., and John Gallagher. 52 Weeks of Sales Success: America's #1 Salesman Shows You How to Close Every Deal! New York: HarperBusiness, 1999.

MLA (9th ed.) Citation

Roberts, Ralph R., and John Gallagher. 52 Weeks of Sales Success: America's #1 Salesman Shows You How to Close Every Deal! HarperBusiness, 1999.