The three C's for piano technic: Cramer, Czerny, Clementi. :
48 selected studies in progressive order for technical development.

APA Citation

Eckstein, M. (1946). The three C's for piano technic: Cramer, Czerny, Clementi.: 48 selected studies in progressive order for technical development. New York: C. Fischer.

MLA Citation

Eckstein, Maxwell. The Three C's for Piano Technic: Cramer, Czerny, Clementi.: 48 Selected Studies In Progressive Order for Technical Development. New York: C. Fischer, 1946.

Warning: These citations may not always be complete (especially for serials).