APA (7th ed.) Citation

Heller, S. Etudes pour piano - 30 etudes progressives. Schlesinger'sche Buch-u. Musikhandlg.

Chicago Style (17th ed.) Citation

Heller, Stephen. Etudes Pour Piano - 30 Etudes Progressives. Berlin: Schlesinger'sche Buch-u. Musikhandlg.

MLA (9th ed.) Citation

Heller, Stephen. Etudes Pour Piano - 30 Etudes Progressives. Schlesinger'sche Buch-u. Musikhandlg.

Warning: These citations may not always be 100% accurate.