R.K. · Richard Kirstein · Richard S. Keirstead · Riegert. Kristina
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Japanese Kanji a Day Practice Pad Volume 1 | 978-0-8048-3548-0 (0-8048-3548-9) | 2004 |
| Kanji-a-Day Practice Pad | 978-0-8048-2004-2 (0-8048-2004-X) | 1994 |