APA (7th ed.) Citation

Humperdinck, E., Humperdinck, E., & Humperdinck, E. (2000). Parsifal-Skizzen. Görres.

Chicago Style (17th ed.) Citation

Humperdinck, Engelbert, Engelbert Humperdinck, and Engelbert Humperdinck. Parsifal-Skizzen. Koblenz: Görres, 2000.

MLA (9th ed.) Citation

Humperdinck, Engelbert, et al. Parsifal-Skizzen. Görres, 2000.