APA (7th ed.) Citation

Heller, S. 25 melodische Etüden: Op. 45 = 25 melodious studies. Peters.

Chicago Style (17th ed.) Citation

Heller, Stephen. 25 Melodische Etüden: Op. 45 = 25 Melodious Studies. Leipzig: Peters.

MLA (9th ed.) Citation

Heller, Stephen. 25 Melodische Etüden: Op. 45 = 25 Melodious Studies. Peters.

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