APA (7th ed.) Citation

Chopin, F., & Bjørkøe, C. Waltz in D flat major, op. 70 no. 3.

Chicago Style (17th ed.) Citation

Chopin, Frédéric, and Christina Bjørkøe. Waltz in D Flat Major, Op. 70 No. 3.

MLA (9th ed.) Citation

Chopin, Frédéric, and Christina Bjørkøe. Waltz in D Flat Major, Op. 70 No. 3.

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