@inbook {Constable1971, title = {The Popularity of Twelfth Century Spiritual Writers in the Late Middle Ages}, booktitle = {Renaissance Studies in Honor of Hans Baron}, year = {1971}, pages = {5{\textendash}28}, publisher = {Northern Illinois University Press}, organization = {Northern Illinois University Press}, address = {DeKalb}, author = {Constable, Giles}, editor = {Molho, Anthony and Tedeschi, John A.} } @book {Constable1967, title = {The Letters of Peter the Venerable}, volume = {2}, year = {1967}, publisher = {Princeton University Press}, organization = {Princeton University Press}, address = {Cambridge, Mass}, editor = {Constable, Giles} }