MLA

Douglas, Norman, 1868-1952. Sotheby's sale of Orioli's Douglas manuscripts. Box 32, folder 540a. 1937. https://collections.library.yale.edu/catalog/16454723.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 32, folder 540a"])(1937)[Sotheby's sale of Orioli's Douglas manuscripts]. https://collections.library.yale.edu/catalog/16454723.