MLA
Lefferts (Wilmington, Del.). Depiction of the McDows with seated man in black face with a child on one side and an adult in costume on the other. unknown. Langmuir Deposit - Sept 2020. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/679573n672-cor.
APA, 6th edition
Lefferts (Wilmington, Del.). (unknown)[Depiction of the McDows with seated man in black face with a child on one side and an adult in costume on the other]. Langmuir Deposit - Sept 2020, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/679573n672-cor.
Chicago
Lefferts (Wilmington, Del.), Depiction of the McDows with seated man in black face with a child on one side and an adult in costume on the other, unknown, Langmuir Deposit - Sept 2020, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/679573n672-cor.