MLA

Saarinen, Eero, 1910-1961. Childhood home. Box 6, folder 48. undated. https://collections.library.yale.edu/catalog/10017574.

APA, 6th edition

Saarinen, Eero, 1910-1961. (["Box 6, folder 48"])(undated)[Childhood home]. https://collections.library.yale.edu/catalog/10017574.