MLA

Thistlewood, Thomas, 1721-1786. 18. Diary. Box 4, folder 18. 1767. https://collections.library.yale.edu/catalog/11864865.

APA, 6th edition

Thistlewood, Thomas, 1721-1786. (["Box 4, folder 18"])(1767)[18. Diary]. https://collections.library.yale.edu/catalog/11864865.