APA (7th ed.) Citation

Otter, W. (1930). This postcard was send to B. Hessels, conscientious objector in Holland.

Chicago Style (17th ed.) Citation

Otter, W. This Postcard Was Send to B. Hessels, Conscientious Objector in Holland. 1930.

MLA (8th ed.) Citation

Otter, W. This Postcard Was Send to B. Hessels, Conscientious Objector in Holland. 1930.

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