APA (7th ed.) Citation

Helmann, J. N. (1969). The consciously controlled piano tone: Most natural approach to the problem of artistic piano playing. [publisher not identified].

Chicago Style (17th ed.) Citation

Helmann, Jacob N. The Consciously Controlled Piano Tone: Most Natural Approach to the Problem of Artistic Piano Playing. [New York]: [publisher not identified], 1969.

MLA (8th ed.) Citation

Helmann, Jacob N. The Consciously Controlled Piano Tone: Most Natural Approach to the Problem of Artistic Piano Playing. [publisher not identified], 1969.