| title | ISBN-13 | year of publication |
|---|---|---|
| Business Mathematics and Statistics | 978-0-304-29760-3 | 1977 |
| Business Mathematics and Statistics | 978-0-304-29384-1 | 1974 |
| Economic System | 978-0-304-29621-7 | 1975 |
| Modern Arithmetic | 978-0-304-29607-1 | 1975 |
| Modern Arithmetic | 978-0-304-93629-8 | 1970 |