TY  - BOOK
AU  - Peter Wagner, Richard L. Crocker
TI  -  Introduction to the Gregorian melodies : a handbook of plainsong. Part 1. Origin and development of the forms of the liturgical chant up to the end of the Middle Ages
SN  - 9780306762840, 0306762846
PY  - 1986///
CY  - New York
PB  -  Da Capo Press, 
ER  -