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

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