Publisher
- Catholic Truth Society6
- Alpha, a member of Penguin Group (USA), Inc3
- Continuum2
- HarperCollins e-books2
- Lexington Books2
- Palgrave Macmillan2
- Andrews UK Limited1
- Austin Macauley Publishers1
- Bloomsbury1
- Bloomsbury Academic1
- Cambridge Scholars Publishing1
- Cliff Street Books1
- For Dummies1
- For Dummies, a Wiley brand1
- Grupo Nelson1
- HarperCollinsPublishers1
- Hodder & Stoughton1
- Routledge1
- Sheed and Ward1
- Springer1