Nicholas Epley finds people significantly underestimate the positive impact a letter of gratitude has on its recipient. Learn how to use an effective letter of appreciation to show your gratitude for job opportunities, job search referrals, and other kindnesses.Mayor's Office Letter Request Form. Requests must be made 10 business days prior to date the document is needed. A thankyou letter is a typed or written note that expresses your words of gratitude to somebody for some reason. In authordate style, an intext citation consists of the author's name, the publication year, and (if relevant) a page number. Do not use first names. We ask that you write a letter expressing your thanks to the donor(s) associated with your particular scholarship. Be brief, warm, and sincere. Postcards may be used for short notes.