Forsyth, P. (2009). 100 great sales ideas: From leading companies around the world. Marshall Cavendish Business.
Lua i Stíl Chicago (17ú heag.)Forsyth, Patrick. 100 Great Sales Ideas: From Leading Companies Around the World. London: Marshall Cavendish Business, 2009.
Lua MLA (9ú heag.)Forsyth, Patrick. 100 Great Sales Ideas: From Leading Companies Around the World. Marshall Cavendish Business, 2009.
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