APA (7th ed.) Citation

Haeckel, G., & Haeckel, O. Die Revolution in Berlin . November - Dezember 1918.

Chicago Style (17th ed.) Citation

Haeckel, Georg, and Otto Haeckel. Die Revolution in Berlin . November - Dezember 1918.

MLA (8th ed.) Citation

Haeckel, Georg, and Otto Haeckel. Die Revolution in Berlin . November - Dezember 1918.

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