Steve Clark offers the following article written by a student in the Duke University.
This paper was submitted as his final project to complete the program.
Examples of Steve’s letters are available at Sample Letters.
“Whatever your motivation, this article helps you to write a letter that gets published. It addresses the following elements to writing an effective letter:
Choosing a topic
Setting the tone
Submitting to the paper”
Read more: http://stc-carolina.org