Career orientation experts formally recognize three distinct types of cover letters. There are those that you submit in response to a job posting, and then there are those that you may send to certain companies you want to work for asking about potential opportunities. The third type is a referral letter, and it is widely recognized as being the most effective. It includes the name of a friend or associate of the addressee, along with detailing your relationship with that person and how he or she believes you would be a good fit in the addressee’s organization. Referral cover letters are so valuable because of their associations. When a recruiter or hiring manager sees that you have the endorsement of someone he or she trusts, you immediately gain an advantage over your fellow applicants. Referrals need not only be those that you also know well; they can be people you meet at professional conference, or a consultant that you worked with on a business project. Where can you find good examples of referral cover letters? LiveCareer.com offers samples such as this one for you to use as reference. Note how the applicant begins by immediately referencing their common associate, but then dedicates the rest of the letter to detailing her own skills and experience.