Cita APA (7th ed.)

Hamann, J. G., & Nadler, J. (1999). Der Schlüssel. Antiquariat Willi.

Cita Chicago (17th ed.)

Hamann, Johann Georg, i Josef Nadler. Der Schlüssel. Wuppertal: Brockhaus; Tübingen: Antiquariat Willi, 1999.

Cita MLA (8th ed.)

Hamann, Johann Georg, i Josef Nadler. Der Schlüssel. Antiquariat Willi, 1999.