Cita APA (7a ed.)

Haack, H. (1910). Geographen-Kalender 1910. Justus Perthes.

Cita Chicago Style (17a ed.)

Haack, Hermann. Geographen-Kalender 1910. Gotha: Justus Perthes, 1910.

Cita MLA (9a ed.)

Haack, Hermann. Geographen-Kalender 1910. Justus Perthes, 1910.