Be as concrete and detailed as possible. Discuss the student's potential in his or her chosen field. Have the student give you the name and complete address of the person you'll be writing to along with the date the letter is needed. Within the letter, include your title and telephone number or address where you can be reached. Write the letter as soon as possible while the information is still fresh in your mind.
Letters are generally one typed page.
Keep a copy of the letter for your files. 3rd paragraph - refer the reader to the enclosed resume. This area can be increased if the body of the letter is extremely brief.