[Letter : David Brainerd to William Bradford, Philadelphia]
MLA
Brainerd, David, 1718-1747. [Letter : David Brainerd to William Bradford, Philadelphia]. Folder 5. 1746 September 20. https://collections.library.yale.edu/catalog/9998262.
APA, 6th edition
Brainerd, David, 1718-1747. (["Folder 5"])(1746 September 20)[[Letter : David Brainerd to William Bradford, Philadelphia]]. https://collections.library.yale.edu/catalog/9998262.