APA (7th ed.) Citation

Ritter, C. Über den Humboldt-Gletscher.

Chicago Style (17th ed.) Citation

Ritter, C. Über Den Humboldt-Gletscher.

MLA (9th ed.) Citation

Ritter, C. Über Den Humboldt-Gletscher.

Warning: These citations may not always be 100% accurate.