STILL, R. (1988). SALES MANAGEMENT (5TH.). PEARSON.
Chicago Style aipamenaSTILL, RICHARD. SALES MANAGEMENT. 5TH. NEW DELHI: PEARSON, 1988.
MLA aipamenaSTILL, RICHARD. SALES MANAGEMENT. 5TH. PEARSON, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.