| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Four Letter Word: Invented Correspondence from the Edge of Modern Romance | Hardcover | 978-1-4165-6973-2 | 2008 | Joshua Knelman |
| Four Letter Word: New Love Letters | Paperback | 978-0-09-950364-4 | 2009 | " |
| Four Letter Word: New Love Letters | Hardcover | 978-0-7011-8093-5 | 2007 | " |
| Four Letter Word: Original Love Letters | " | 978-0-307-39676-1 | 2008 | " |
| Four Letter Word: Original Love Letters | Paperback | 978-0-307-39677-8 | 2008 | " |
Alfred A. Knopf · Chatto & Windus · Random House · Simon & Schuster