[Letter : W[illia]m Petty, 1653 March 1 to Samuel Hartlib]
MLA
Petty, William, Sir, 1623-1687. [Letter : W[illia]m Petty, 1653 March 1 to Samuel Hartlib]. Folder 16807. 1653 March 1. https://collections.library.yale.edu/catalog/10034174.
APA, 6th edition
Petty, William, Sir, 1623-1687. (["Folder 16807"])(1653 March 1)[[Letter : W[illia]m Petty, 1653 March 1 to Samuel Hartlib]]. https://collections.library.yale.edu/catalog/10034174.