APA (7th ed.) Citation

Sill, O. (1961). U-Bahn-Bau in Hamburg. Tiefbauamt.

Chicago Style (17th ed.) Citation

Sill, Otto. U-Bahn-Bau in Hamburg. Hamburg: Tiefbauamt, 1961.

MLA (9th ed.) Citation

Sill, Otto. U-Bahn-Bau in Hamburg. Tiefbauamt, 1961.

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