MLA

Wheaton, Joseph, 1755-1828. Green, Moses, autograph letter signed to Wheaton (written for Green by William W. Hening). Box 1, folder 13. 1831 December 21. https://collections.library.yale.edu/catalog/32528334.

APA, 6th edition

Wheaton, Joseph, 1755-1828. (["Box 1, folder 13"])(1831 December 21)[Green, Moses, autograph letter signed to Wheaton (written for Green by William W. Hening)]. https://collections.library.yale.edu/catalog/32528334.