MLA

James, Rebecca Salsbury, 1891-1968. O'Keeffe, Georgia. Box 1a, folder 28-35. 1926-67. https://collections.library.yale.edu/catalog/32471846.

APA, 6th edition

James, Rebecca Salsbury, 1891-1968. (["Box 1a, folder 28-35"])(1926-67)[O'Keeffe, Georgia]. https://collections.library.yale.edu/catalog/32471846.