Cite

O'Neill, Mary Ellen Quinlan to Agnes Boulton and Eugene O'Neill

MLA

Boulton, Agnes, 1893-1968. O'Neill, Mary Ellen Quinlan to Agnes Boulton and Eugene O'Neill. Box 3, folder 141. 1919-20. https://collections.library.yale.edu/catalog/32307902.

APA, 6th edition

Boulton, Agnes, 1893-1968. (["Box 3, folder 141"])(1919-20)[O'Neill, Mary Ellen Quinlan to Agnes Boulton and Eugene O'Neill]. https://collections.library.yale.edu/catalog/32307902.