Historical Society of Pennsylvania. (1991). Guide to the manuscript collections of the Historical Society of Pennsylvania. Histor. Soc. of Pennsylvania.
Chicago-Zitierstil (17. Ausg.)Historical Society of Pennsylvania. Guide to the Manuscript Collections of the Historical Society of Pennsylvania. Philadelphia: Histor. Soc. of Pennsylvania, 1991.
MLA-Zitierstil (9. Ausg.)Historical Society of Pennsylvania. Guide to the Manuscript Collections of the Historical Society of Pennsylvania. Histor. Soc. of Pennsylvania, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.