Dixon Matthew. (2012). Challenger Sale: Taking Control of the Customer Conversation. Portfolio.
Chicago-referens (17:e uppl.)Dixon Matthew. Challenger Sale: Taking Control of the Customer Conversation. London: Portfolio, 2012.
MLA-referens (9:e uppl.)Dixon Matthew. Challenger Sale: Taking Control of the Customer Conversation. Portfolio, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.