Cite

4 autograph letters, signed, and 5 typed letters, signed, to Harold Jackman, 1 typed letter includes handwritten additions

MLA

4 Autograph Letters, Signed, and 5 Typed Letters, Signed, to Harold Jackman, 1 Typed Letter Includes Handwritten Additions. 1924. https://collections.library.yale.edu/catalog/16818456.

APA, 6th edition

4 autograph letters, signed, and 5 typed letters, signed, to Harold Jackman, 1 typed letter includes handwritten additions. (1924). https://collections.library.yale.edu/catalog/16818456.