Benjamin Franklin: letter to Thomas Leech, Esq., Speaker of the House of Representatives (postscript in Franklin's hand); London (includes photostatic copy and typed transcript)
MLA
Mason, William Smith, 1866-. Benjamin Franklin: letter to Thomas Leech, Esq., Speaker of the House of Representatives (postscript in Franklin's hand); London (includes photostatic copy and typed transcript). Box 61 (Oversize), folder 2271. 1758 May 13. https://collections.library.yale.edu/catalog/33490120.
APA, 6th edition
Mason, William Smith, 1866-. (["Box 61 (Oversize), folder 2271"])(1758 May 13)[Benjamin Franklin: letter to Thomas Leech, Esq., Speaker of the House of Representatives (postscript in Franklin's hand); London (includes photostatic copy and typed transcript)]. https://collections.library.yale.edu/catalog/33490120.
