Cite

[Postcard : 1913 March 14, Franz Marc to Marsden Hartley]

MLA

Marc, Franz, 1880-1916. [Postcard : 1913 March 14, Franz Marc to Marsden Hartley]. Box 14 | Folder: Marc, Franz. 1913 March 14. https://collections.library.yale.edu/catalog/11194865.

APA, 6th edition

Marc, Franz, 1880-1916. (["Box 14 | Folder: Marc, Franz"])(1913 March 14)[[Postcard : 1913 March 14, Franz Marc to Marsden Hartley]]. https://collections.library.yale.edu/catalog/11194865.