Cite

Diagram of the situation at the battle of Wounded Knee at the time the Indians opened fire

MLA

Diagram of the Situation at the Battle of Wounded Knee at the Time the Indians Opened Fire. 1890. https://collections.library.yale.edu/catalog/2018507.

APA, 6th edition

Diagram of the situation at the battle of Wounded Knee at the time the Indians opened fire. (1890). [Card photograph albums, Card photographs, Maps]. https://collections.library.yale.edu/catalog/2018507.