A Few Minutes on Books of Hours: A introductory essay by Patrick Haynes.
A Hypertext Book of Hours: The complete text for the Use of Rome in Latin and English based on a 16th-century English Primer.
Book of Hours Exhibition, University of Pennsylvania: Books of Hours in the collection of Lawrence J. Schoenberg. Images and commentary.
Books of Hours and the Transition to Print Culture: An online essay comparing printed books of hours with their manuscript precedents.
Books of Hours in the Koninklijke Bibliotheek, The Hague: A general introduction to Books of Hours, with links to hundreds of high-quality images from manuscripts in the Koninklijke Bibliotheek.
Books of Hours in the Wellesley College Library: A selection of images from five different Books of Hours, with a brief introduction.
Books of Hours: Introduction and Tutorial: Erik Drigsdahl's guide to the scholarly study of Books of Hours.
Depicting Devotion: Illuminated Books of Hours from the Middle Ages: An on-line exhibition of Books of Hours in the collection of the Department of Special Collections, Washington University Libraries, St. Louis.
Franciscan Books of Hours from Italy in the Newberry Library: Scholarly essay on three late-15th-century Italian Books of Hours, by Paula Hutton.
Hore Beate Marie Virginis - Index to a Selection of Uses: A scholarly index to local variations in the texts of Books of Hours.
Leaves of Gold: Books of Hours: Images and catalogue entries for nineteen books of hours. Part of an exhibition of illuminated manuscripts from Philadelphia collections.
Painted Prayers: Books of Hours from the Morgan Library: Web site of an exhibition at the J. Paul Getty Museum.
Sacred Image and Illusion in Late Flemish Manuscripts: Scholarly essay on the decoration of late-15th- and early-16th-century Books of Hours from France and Flanders, by Robert Calkins.
The Medieval Bestseller: Online version of an exhibition of Books of Hours in the Getty Museum.