As a professor I've seen dozens of employment related books, most of which totally miss the mark. Nothing could be further from the truth. Unfortunately, most recruiters come from HR, not sales. HR requires knowledge of laws, policies, and managing people resources, which are important but they are hardly the essence of sales. This shared responsibility should include managers, employees, PR, marketing and the sales force.
Employees can help through referrals.
There are a variety of ways that the sales function can bolster a firm's recruiting effort through great advice and teaching. Building a long term image outside the firm is essential for product success. It is also essential for recruiting. There are numerous things sales people can do on their own to aid a firms recruiting effort. If you are really bold, try converting some of your sales people to recruiters.