Frotscher, G., & Michaelis, K. (1981). Performance practices of early music: A comprehensive reference work about music of past ages for musicians, interpreters and amateurs / Transl. by Kurt Michaelis. Heinrichshofen.

Frotscher, Gotthold, and Kurt Michaelis. Performance Practices of Early Music: A Comprehensive Reference Work About Music of Past Ages for Musicians, Interpreters and Amateurs / Transl. by Kurt Michaelis. New York: Heinrichshofen, 1981.

Frotscher, Gotthold, and Kurt Michaelis. Performance Practices of Early Music: A Comprehensive Reference Work About Music of Past Ages for Musicians, Interpreters and Amateurs / Transl. by Kurt Michaelis. Heinrichshofen, 1981.