If you're planning to quit your job here is the compilation of the best resignation letter samples to help you easily draft your resignation letter. In this article, we discuss what to include in a professional resignation letter and we share examples of resignation letters you can use for reference.A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. Resignation letters are a professional courtesy and a graceful capper to any job. There isn't a real guideline for what to include in a resignation letter, but typically the briefer the better.