| title | ISBN-13 | year of publication |
|---|---|---|
| Theory of Knowledge for the IB Diploma | 978-1-107-61211-2 | 2014 |
| Theory of Knowledge for the IB Diploma | 978-0-521-54298-2 | 2005 |
| Theory of Knowledge for the IB Diploma Full Colour Edition | 978-1-107-66996-3 | 2011 |
| Theory of Knowledge for the IB Diploma Teacher's Book | 978-0-521-54297-5 | 2020 |
De L. · R.D. · R. L · Richard D. · Richard L. · Richard V. · V. L.