Lefferts, Peter M. accessed 13 November 2015. Sources of Thirteenth-Century English Polyphony: Catalogue with Descriptions.  available online at http://digitalcommons.unl.edu/musicfacpub/45.

Bent, Margaret, Peter M Lefferts, and Jared C. Hartt. 2021. The Dorset Rotulus: Contextualizing and Reconstructing the Early English Motet. Studies in Medieval and Renaissance Music.  Boydell Press.

Summers, William John, and Peter M Lefferts (editors). 2016. English 13th-Century Polyphony (EECM 57).

Lefferts, Peter M. 2012. Sources of Thirteenth-Century English Polyphony: Catalogue with Descriptions. Faculty Publications: School of Music.  University of Nebraska - Lincoln.

Lefferts, Peter M. 2012. Sources of Thirteenth-Century English Polyphony: Catalogue with Descriptions. Faculty Publications: School of Music.  University of Nebraska - Lincoln.

Lefferts, Peter M. 2003. review of EECM 42. Plainsong and Medieval Music, 213-22.

Sanders, Ernest H, and Peter M Lefferts. 2001. English Polyphony, 1270-1400, The Worcester Fragments. New Grove Dictionary of Music and Musicians, 878-879.

Fuller, Sarah. 1990. Modal Tenors and Tonal Orientation in Motets of Guillaume de Machaut. Studies in Medieval Music: Festschrift for Ernest H. Sanders, Current Musicology. edited by Sarah Fuller, 199-245. New York.

Lefferts, Peter M. 1990. Current Musicology . 247-282.

Lefferts, Peter M. 1990. Cantilena and Antiphon: Music for Marian Services in Late Medieval England. Studies in Medieval Music: Festschrift for Ernest H. Sanders, 247-82. Columbia University.

Lefferts, Peter M. 1988. Facsimiles of fourteenth-century English polyphony. Royal Musical Association Research Chronicle, 83-95.

Lefferts, Peter M. 1988. 'Subtilitas' in the Tonal Language of 'Fumeux fume'. Early Music, 176-183.

Lefferts, Peter M. 1987. Review of Margaret Bent and Anne Hallmark (eds), The Works of Johannes Ciconia. Polyphonic Music of the Fourteenth Century 24 (Monaco: Éditions de l'Oiseau-Lyre, 1984). Notes, 142–44.

Sanders, Ernest, Frank Llewellyn Harrison, and Peter M Lefferts (editors). 1986. English Music for Mass and Offices (II) and Music for Other Ceremonies. Polyphonic Music of the Fourteenth Century.  Monaco: Éditions de L'Oiseau Lyre.

Lefferts, Peter M. 1986. Three 14th-Century Motets in Honour of Gaston Fébus. Antico Edition,.  Devon.

Lefferts, Peter M. 1986. The Motet in England in the Fourteenth Century. UMI studies in Musicology.  Ann Arbor.

Lefferts, Peter M. 1986. The Motet in England in the Fourteenth Century. Studies in Musicology.  Ann Arbor.

Sanders, Ernest H, Frank Llewellyn Harrison, and Peter M Lefferts (editors). 1983. English Music for Mass and Offices (I). Polyphonic Music of the Fourteenth Century.  Monaco: Éditions de l'Oiseau-Lyre.

Lefferts, Peter M. 1983. The Motet in England in the Fourteenth Century. Columbia University, New York, Ph.D. https://digitalcommons.unl.edu/musicfacpub/29/(Accessed: 4 June 2019).

Lefferts, Peter M, and Margaret Bent (compilers). 1982. New sources of English thirteenth- and fourteenth-century polyphony. Early Music History, 295-306.

Lefferts, Peter M, and Margaret Bent (compilers). 1982. New Sources of English Thirteenth- and Fourteenth-Century Polyphony. Early Music History, 273-362.

Wathey, Andrew B, and Peter M Lefferts. 1982. New sources of English thirteenth- and fourteenth-century polyphony. Early Music History, 321-323.

Wathey, Andrew B. 1982. New sources of English thirteenth- and fourteenth-century polyphony. Early Music History, 323-329.

Lefferts, Peter M, and Roger Bowers. 1982. London, Public Record Office, LR 2/261, in: New sources of English thirteenth- and fourteenth-century polyphony. Early Music History, 332-337.

Lefferts, Peter M. 1982. York, Minster Library, MS XVI.N.3, in: New sources of English thirteenth- and fourteenth-century polyphony. Early Music History, 358-361.

Bent, Margaret, and Peter M Lefferts (compilers). 1981. New Sources of English Thirteenth- and Fourteenth-Century Polyphony. Early Music History, 273-362.

Lefferts, Peter M. 1981. Two English Motets on Simon de Montfort. Early Music History, 203-225.

Lefferts, Peter M. 1979. Medieval English Fragments. Music and Letters, 250-1.