Serpent Mound and other mounds
MLA
Erdoes, Richard, 1912-2008. Serpent Mound and other mounds. Box 53 | Prehistory; Mound Builders. 1979, undated. https://collections.library.yale.edu/catalog/2082761.
APA, 6th edition
Erdoes, Richard, 1912-2008. (["Box 53 | Prehistory; Mound Builders"])(1979, undated)[Serpent Mound and other mounds]. https://collections.library.yale.edu/catalog/2082761.