John C. Cavadini 
The Last Christology of the West [PDF ebook] 
Adoptionism in Spain and Gaul, 785-82

This book is a volume in the Penn Press Anniversary Collection. To mark its 125th anniversary in 2015, the University of Pennsylvania Press rereleased more than 1, 100 titles from Penn Press’s distinguished backlist from 1899-1999 that had fallen out of print. Spanning an entire century, the Anniversary Collection offers peer-reviewed scholarship in a wide range of subject areas.