APA (7th ed.) Citation

Historical Society of Pennsylvania. (1991). Guide to the manuscript collections of the Historical Society of Pennsylvania. Historical Society of Pennsylvania.

Chicago Style (17th ed.) Citation

Historical Society of Pennsylvania. Guide to the Manuscript Collections of the Historical Society of Pennsylvania. Philadelphia, Pa.: Historical Society of Pennsylvania, 1991.

MLA (9th ed.) Citation

Historical Society of Pennsylvania. Guide to the Manuscript Collections of the Historical Society of Pennsylvania. Historical Society of Pennsylvania, 1991.