MLA

Pound, Ezra, 1885-1972. Devlin, Vianney M., O.F.M. Box 1, folder 9-10. 1953-57. https://collections.library.yale.edu/catalog/17078439.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 1, folder 9-10"])(1953-57)[Devlin, Vianney M., O.F.M]. https://collections.library.yale.edu/catalog/17078439.