3-6 reference letters per applicant. Ask for references as soon as you have a signed contract.Below are a couple example letters and templates to point you and your references in the right direction. Boost your renewal rates with a foolproof membership renewal letter! One thing I learned when going through the process is to ensure that you ask your references to include their contact information on the letter. Wondering how to write the perfect coop reference letters? A formal letter for a membership typically follows a professional format and includes specific information related to the membership application or request. Use this sample reference letter template when a colleague, former team member, student, or acquaintance asks for a personal recommendation. The letter should be addressed to "Members of the Board" and signed digitally or in ink. Make sure it is typed and free of grammatical and spelling errors.