To Whom It May Concern,

　　I'm writing this reference letter on behalf of Betty Yang. I have been Betty's supervisor for four years at Nanjing University. During these four years, I have watched her rapidly advance from an entry-level position to a senior one. I've never hesitated to recommend her for promotion when positions became available.

　　Betty derives satisfaction from helping our customers troubleshoot problems. Many of those who have received help from Betty specifically ask for her if they need to contact support again, and for good reason: She's professional, courteous and quick to help. She is skilled and tackles problems without prompting. I often see Betty in our lab before or after work hours, working on problems.

　　Betty is a team player who is always willing to share her knowledge with others. For example, thanks to Betty's willingness to share the trouble-ticket notes she so meticulously recorded and compiled, our department was able to create a step-by-step online troubleshooting guide for our field engineers. Consequently, we've seen an increase in customer satisfaction, a reduction in complaints, and significant savings for the department.

　　I have nothing but good things to say about Betty and I would strongly recommend her for any endeavor she chooses. Please don't hesitate to contact me if you need any more information.

　　Sincerely,

　　[Signature]

　　Tom Green

　　Supervisor

　　***@***.com