Thoroughbass method : with excerpts from the theoretical works of Praetorius, Niedt, Telemann, Mattheson, Heinichen, J. S. & C. P. E. Bach, Quantz, and Padre Mattei, and numerous examples from the literature of the 17th and 18th centuries - Keller, Hermann 1885-1967 (W.W. Norton, 1965)