Mathers, E. Powys
MLA
Douglas, Norman, 1868-1952. Mathers, E. Powys. Box 30, folder 520. 1931 March 30. https://collections.library.yale.edu/catalog/17341851.
APA, 6th edition
Douglas, Norman, 1868-1952. (["Box 30, folder 520"])(1931 March 30)[Mathers, E. Powys]. https://collections.library.yale.edu/catalog/17341851.