The art and science of the book (codicology, paleography, text editing, paper studies)
The editing of medieval texts (Latin, English, Italian)
Medieval Italian and English literary relations (especially Boccaccio and Chaucer)
The Bible (text, history, criticism, literary influence)
Medieval Latin (especially liturgical drama and history of liturgy)
History of early printing
18th and 19th century gothic fiction
Recent Graduate Courses:
Paleography, Codicology, Text Editing
Editing the Medieval Text
Editing the Medieval English Text
Medieval and Renaissance Paleography
History of the Book
The Medieval Book
The Transition from Manuscript Culture to Print Culture in the Late 15th Century
The Age of Caxton
The Study of Incunabula
History of the Bible
The Bible: Text, Criticism, and Literary Relations
The Bible in the Middle Ages
Latin Reading Seminar: The Medieval Biblical Exegetes
History of Literature
Chaucer's Canterbury Tales
The Works of the Pearl Poet
Italian-English Literary Commerce in the Late 14th Century
Maidens, Madmen, and Haunted Houses: 18th and 19th Century Gothic Fiction
Officium Presentationis Beate Virginis Marie in Templo. Introduction, edition, and translation. with James Boyce. Ottawa: Institute of Mediaeval Music, 2001.
Watermarks in the Manuscripts of Boccaccio's Teseida. A Catalogue, codicological study, and album. Biblioteca di Bibliografia Italiana 149. Florence: Olschki, 1997.
Philippe de Mézières' Campaign for the Feast of Mary's Presentation. Toronto Medieval Latin Texts 11. Toronto: Pontifical Institute of Mediaeval Studies and U of Toronto P, 1981.
On the Discrimination of Gothicisms. New York: Arno / New York Times, 1980.
A Casebook of Grant Proposals in the Humanities. (co-author). New York: Neal-Schuman, 1982.
Grants in the Humanities: A Scholar's Guide to Funding Sources. New York: Neal- Schuman, 1980; 2d ed. New York, 1984.
"The Oratoriana Teseida: Witness of a Lost Beta Autograph", Studi sul Boccaccio 40 (2012): 105-185, Fig. 1-10.
"The Knight's Tale." Sources and Analogues of THE CANTERBURY TALES II. Ed. Robert M. Correale and Mary Hamel. Cambridge, Eng.: D.S. Brewer, 2005. 87-247.
"Philippe de Mézières" in Trade, Travel, and Exploration in the Middle Ages: An Encyclopedia. New York: Garland, 2000.
"'hir names rad were everichon': le modalita di Geoffrey Chaucer nel 'denominare' i pellegrini-narratori dei Canterbury Tales." Rivista Italiana di Onomastica. III, 1 (1997): 109-28.
"Boccaccio Visualizzato: 3. United States. Private Collection (ms. Kettaneh)." Studi sul Boccaccio. 21 (1991 - 1992): 19-43, plus 11 illustrations.
"Giovanni Boccaccio, Il Teseida." pp. 53-57 in Sixty Bokes Olde and Newe. Knoxville: New Chaucer Society, 1986.
"Chaucer, the Teseida, and the Visconti Library at Pavia: A Hypothesis." Medium Aevum 51:1 (1982): 92-101.