APA (7th ed.) Citation

Schumann, R., Liszt, F., Schumann, C., & Gabriel, E. (2010). Elfrun Gabriel. Querstand.

Chicago Style (17th ed.) Citation

Schumann, Robert, Franz Liszt, Clara Schumann, and Elfrun Gabriel. Elfrun Gabriel. [S.l.]: Querstand, 2010.

MLA (9th ed.) Citation

Schumann, Robert, et al. Elfrun Gabriel. Querstand, 2010.