Geographical Society of Philadelphia. Charter, by-laws, list of members. the Society.
Cita Chicago (17th ed.)Geographical Society of Philadelphia. Charter, By-laws, List of Members. Philadelphia: the Society.
Cita MLA (8th ed.)Geographical Society of Philadelphia. Charter, By-laws, List of Members. the Society.
Atenció: Aquestes cites poden no estar 100% correctes.