APA (7th ed.) Citation

Karg-Elert, S., Voelker, E., & Völker, E. Ultimate organ works. Aeolus.

Chicago Style (17th ed.) Citation

Karg-Elert, Sigfrid, Elke Voelker, and Elke Völker. Ultimate Organ Works. [S.l.]: Aeolus.

MLA (9th ed.) Citation

Karg-Elert, Sigfrid, et al. Ultimate Organ Works. Aeolus.