The enclosure letter should be designed to serve those persons as well. In this article, we explain what an enclosure is and how to cite one, and we provide an example of an enclosure in a business letter.How to correctly format a business letter. Includes detailed instructions and example on how to write a business letter for any situation. List enclosures in the enclosure line in the order they appear in the text. Identify an enclosure using the same format of "enclosure (1)". Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. The text within these letters should be individualized for each child and family. 13. Enclosures. An enclosure can prevent a letter from becoming too detailed. There are different styles of letters, and it is important to know the different styles when seeking employment.