APA (7th ed.) Citation

May, O. (2013). Weltkrieg der Postkarten 1914 - 1918. Franzbecker.

Chicago Style (17th ed.) Citation

May, Otto. Weltkrieg Der Postkarten 1914 - 1918. Hildesheim: Franzbecker, 2013.

MLA (8th ed.) Citation

May, Otto. Weltkrieg Der Postkarten 1914 - 1918. Franzbecker, 2013.

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