| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Ethnic Trinities and Their Relations to the Christian Trinity: A Chapter in the Comparative History of Religions | 978-1-295-30620-6 (1-295-30620-4) | 2013 |
| The Ethnic Trinities and Their Relations to the Christian Trinity: A Chapter in the Comparative History of Religions | 978-1-142-47786-8 (1-142-47786-X) | 2010 |