Koval N.N. · Koval N. (red.) · N. Koval' · V. N. Koval'nogov
| title | ISBN-13 | year of publication |
|---|---|---|
| Angliyskiy dlya malyshey: Tsvetnye shariki. | 978-966-7453-03-9 | 2013 |
| Forma | 978-966-08-1134-8 | 2006 |
| Kto chto govorit | 978-966-08-1136-2 | 2006 |
| Novyy sbornik razvivayuschih zadaniy | 978-966-313-232-7 | 2013 |
| Schet | 978-966-08-1128-7 | 2006 |
| Tsvet | 978-966-08-1130-0 | 2006 |