Heller, S. Twenty four studies for rhythm and expression: Opus 125 for piano. Alfred Publishing.
Citazione stile Chigago Style (17a edizione)Heller, Stephen. Twenty Four Studies for Rhythm and Expression: Opus 125 for Piano. Van Nuys, CA: Alfred Publishing.
Citatione MLA (9a ed.)Heller, Stephen. Twenty Four Studies for Rhythm and Expression: Opus 125 for Piano. Alfred Publishing.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.