If you can, relate specific instances where you observed the person . How to write a reference letter · refresh your memory about the person. Sample professional and personal reference letters, letters asking for a reference, reference lists, and tips and advice for writing great recommendations. A reference letter is used to advocate for someone and provides a general overview of the individual's skills, abilities, character, and knowledge. What to include in a letter of reference · how you know the candidate (in what capacity and for how long) · positive characteristics about the person that are .