APA (7th ed.) Citation

Busoni, F., & Petri, E. Perpetuum mobile.

Chicago Style (17th ed.) Citation

Busoni, Ferruccio, and Egon Petri. Perpetuum Mobile.

MLA (9th ed.) Citation

Busoni, Ferruccio, and Egon Petri. Perpetuum Mobile.

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