MLA

Erdoes, Richard, 1912-2008. Various Fights, Sand Creek, Black Hawk, Etc.. Box 45 | Plains Indian History I. 1976, undated. https://collections.library.yale.edu/catalog/10256330.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 45 | Plains Indian History I"])(1976, undated)[Various Fights, Sand Creek, Black Hawk, Etc.]. https://collections.library.yale.edu/catalog/10256330.