| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Emperor and the Saint: Frederick II of Hohenstaufen, Francis of Assisi, and Journeys to Medieval Places | 978-O-8758O-439-2 (O-8758O-439-X) | 2011 |
"F.C." · R. C. · R. F. · Richard C. · Richard Cassady · Richard F.