(Chicago Manual of Style 14.196)
Author of Letter, letter to the editor, Title of Newspaper, Date of publication, DOI/URL(if online).
1. Cathy Bernard, letter to the editor, New York Times, October 22, 2013, http://www.nytimes.com/2013/10/27/travel/letters-to-the-editor.html?_r=0.
Only need to include these in the notes without any headlines.
If a newspaper or magazine is online include a URL or DOI.
See 14.18 for more information on where to put line breaks for URLs or DOIs.