"Child's Universal History"
MLA
Schwartz, Delmore, 1913-1966. "Child's Universal History". Box 4, folder 263-267. 1943. https://collections.library.yale.edu/catalog/17078941.
APA, 6th edition
Schwartz, Delmore, 1913-1966. (["Box 4, folder 263-267"])(1943)["Child's Universal History"]. https://collections.library.yale.edu/catalog/17078941.