APA
Wotruba T. R., Simpson E. K., . (1989). Sales Management. Massachusetts: PWS-Kent.
Chicago
Wotruba Thomas R, Simpson Edwin K, . 1989. Sales Management. Massachusetts: PWS-Kent.
Harvard
Wotruba T. R., Simpson E. K., . (1989). Sales Management. Massachusetts: PWS-Kent.
MLA
Wotruba Thomas R, Simpson Edwin K, . Sales Management. Massachusetts: PWS-Kent. 1989.