Clarkson, George Austin E. 1970. On the Nature of Medieval Song: The Declamation of Plainchant and the Lyric Structure of the Fourteenth-Century Motet. Columbia University, PhD Dissertation.

Clarkson, George Austin E. 1970. On the nature of medieval song : the declamation of plainchant and the lyric structure of the fourteenth-century motet. Columbia University, Ph.D.