APA (7th ed.) Citation

Germany. Reichspostministerium & Gea Verlag. (1930). Postleitkarte. Gea Verlag.

Chicago Style (17th ed.) Citation

Germany. Reichspostministerium and Gea Verlag. Postleitkarte. Berlin: Gea Verlag, 1930.

MLA (8th ed.) Citation

Germany. Reichspostministerium and Gea Verlag. Postleitkarte. Gea Verlag, 1930.

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