HarperCollins · Littlehampton Book Services Ltd
| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Ants are Fun | Paperback | 978-0-437-90053-1 | 1969 |
| Ants Are Fun | Library Binding | 978-0-06-024359-3 | 1968 |
| The Secret Three | Paperback | 978-0-06-444035-6 | 1982 |
| The Secret Three | Hardcover | 978-0-06-024355-5 | 1963 |
| The Secret Three | " | 978-0-06-024356-2 | 1963 |
| The Secret Three | Paperback | 978-0-437-90027-2 | 1963 |