Cita APA (7th ed.)

Nietzsche, F., & Sorgenfrey, C. (2009). Aphorismen.

Cita Chicago (17th ed.)

Nietzsche, Friedrich, i Clemens Sorgenfrey. Aphorismen. Wiesbaden, 2009.

Cita MLA (8th ed.)

Nietzsche, Friedrich, i Clemens Sorgenfrey. Aphorismen. 2009.