Here are some sample thank you letters of appreciation:

1. Express gratitude for a job interview: Thank the interviewer for the opportunity and express appreciation for the meeting.
2. Show thanks for a job referral or reference: Thank the person who referred or provided a reference for you.
3. Sample letter of appreciation for assistance at work: Express gratitude to a colleague or supervisor for their help and support. ^{topresume.com 1}
4. Appreciation for outstanding performance: Acknowledge someone's hard work and dedication, setting an example for others. ^{sampletemplates.com 2}