Cita APA (7a ed.)

Ermatinger, E. (1990). Gottfrield Keller. Diogenes.

Cita Chicago Style (17a ed.)

Ermatinger, Emil. Gottfrield Keller. Zürich: Diogenes, 1990.

Cita MLA (9a ed.)

Ermatinger, Emil. Gottfrield Keller. Diogenes, 1990.