Wolf, E. (1976). At the instance of Benjamin Franklin: A brief history of the Library Company of Philadelphia, 1731-1976. Philadelphia: Library Co. of Philadelphia.

Wolf, Edwin. At the Instance of Benjamin Franklin: A Brief History of the Library Company of Philadelphia, 1731-1976. Philadelphia: Library Co. of Philadelphia, 1976.

Wolf, Edwin. At the Instance of Benjamin Franklin: A Brief History of the Library Company of Philadelphia, 1731-1976. Philadelphia: Library Co. of Philadelphia, 1976.