It’s a very polite & formal resigntion letter template. You can use it, fill the blank with your information.
You can write your own business letters with these formats. This guide will be very helpful for your next job.
How to write professional cover letters : http://www.yourmomhatesthis.com/download-cover-letter-samples/
Cover Letter Format : Creating An Executive Cover Letter Samples : http://www.yourmomhatesthis.com/cover-letter-format-creating-an-executive-cover-letter-samples/
Resume Format for Freshers & Professionals : http://www.yourmomhatesthis.com/download-resume-format-write-the-best-resume/
Downloadable application letter samples : http://www.yourmomhatesthis.com/download-free-application-letters/