When you ask one of your corporate customers for a referral you could say, “Do you know of anyone else who could use my services?” You might get the names of two or three people who may or may not have any interest in your content. They are suspects, not necessarily prospects. Instead, ask, “If you hear of anyone that I might be able to help, would you let me know?” And then stay in touch periodically by sending your customers articles of interest, pertinent books, promotional items – things that will keep you on their minds and at the top of their list of referrals.