MLA

Stanley, Dorothy, Lady, d. 1926. Letters to Constant Coquelin. Folder [3]. 1897-99. https://collections.library.yale.edu/catalog/2111638.

APA, 6th edition

Stanley, Dorothy, Lady, d. 1926. (["Folder [3]"])(1897-99)[Letters to Constant Coquelin]. https://collections.library.yale.edu/catalog/2111638.