Your first Lab is to write a short note expressing appreciation to someone at work or as a follow-up to an interview. If you want, you can write it in letter format or as a basic two paragraph note, but letter format is not required.

Your first Lab is to write a short note expressing appreciation to someone at work or as a follow-up to an interview. If you want, you can write it in letter format or as a basic two paragraph note, but letter format is not required.
There is more art in writing a short note than meets the eye. There will be a number of occasions throughout your private and work lives when you will have to write a short note to a friend, a family member, a client, or someone at work. Your first Lab is to write a short note expressing appreciation to someone at work or as a follow-up to an interview. If you want, you can write it in letter format or as a basic two paragraph note, but letter format is not required. Your note has to be fulsome and genuine – two to three paragraphs.

It is a letter there is no need for reference

The following will provide you with some examples of Thank-you notes samples.
http://www.thank-you-note-samples.com/business-thank-you-note.html