can u please tell me what Reference Card means in this context?
Mention of a "Reference Card" adds interest and impact when recruiting salesmen
A "reference card" (in sales) has important information on it that would help a saleperson - customer's name, age, address, preferences, buying history, credit score, etc.
This card has information that would take much time to gather. So the fact that it is already done for the salesperson makes selling easier.