Still, R. R., & Norman, G. A. P. N. (1988). Sales Management: Decision, Strategy and Cases (5th.). Dorling Kindersley (India) Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Still, Richard R., agus Govoni A P Norman Norman. Sales Management: Decision, Strategy and Cases. 5th. Noida: Dorling Kindersley (India) Pvt. Ltd, 1988.
Lua MLA (9ú heag.)Still, Richard R., agus Govoni A P Norman Norman. Sales Management: Decision, Strategy and Cases. 5th. Dorling Kindersley (India) Pvt. Ltd, 1988.
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