Ultan, L. (1977). Workbook/anthology for music theory: Problems and practices in the Middle Ages and Renaissance. University of Minnesota Press.

Ultan, Lloyd. Workbook/anthology for Music Theory: Problems and Practices in the Middle Ages and Renaissance. Minneapolis: University of Minnesota Press, 1977.

Ultan, Lloyd. Workbook/anthology for Music Theory: Problems and Practices in the Middle Ages and Renaissance. University of Minnesota Press, 1977.