Chronicle Books · Random House
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| A Letter to My Cat: Notes to Our Best Friends | 978-0-8041-3965-6 (0-8041-3965-2) | 2014 | |
| A Letter to My Dog: Notes to Our Best Friends | 978-1-4521-1442-2 (1-4521-1442-0) | 2012 | Robin Layton · Kimi Culp |
| A Letter to My Mom | 978-0-8041-3967-0 (0-8041-3967-9) | 2015 | |