R.K. · Richard Kradin · Richard Krautheimer · Richard Kreitner
Cornell University Library · The New York Public Library
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Baby birds at home | 978-1-131-05672-2 (1-131-05672-8) | 2011 |
| Birds' Nests, Eggs and Egg-Collecting | 978-1-112-33027-8 (1-112-33027-5) | 2009 |
| Nature's Carol Singers | 978-1-112-46996-1 (1-112-46996-6) | 2009 |