MLA

Lopez, Robert S. (Robert Sabatino), 1910-1985. Photographs, printed ephemera, bibliographies, publications, and slides of towns throughout Europe and Asia Minor. Box 5, folder 1-50. 1960s-1970s, undated. https://collections.library.yale.edu/catalog/10020779.

APA, 6th edition

Lopez, Robert S. (Robert Sabatino), 1910-1985. (["Box 5, folder 1-50"])(1960s-1970s, undated)[Photographs, printed ephemera, bibliographies, publications, and slides of towns throughout Europe and Asia Minor]. https://collections.library.yale.edu/catalog/10020779.