| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Business Book-Keeping: A Manual of Modern Methods in Recording Business Transactions | 978-1-145-60255-7 (1-145-60255-X) | 2010 |
| Problems in Arithmetic, Book 2 | 978-1-146-54667-6 (1-146-54667-X) | 2010 |
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