| title | ISBN-13 | year of publication |
|---|---|---|
| Discovering Numbers with Colour-factor | 978-0-435-02712-4 | 1969 |
| Discovering Numbers with Colour-factor: Tchrs' | 978-0-435-02713-1 | 1969 |
| First Thesaurus Find Your Word | 978-0-431-00080-0 | 1991 |
| Young Scientist: Practical Experiments for Children Bk. 1 | 978-9971-4-9249-6 | 1991 |
| Young Scientist: Practical Experiments for Children Bk. 2 | 978-9971-4-9250-2 | 1991 |