Guide to the historical markers of Pennsylvania, erected by the Pennsylvania Historical and Museum Commission.

MLA

Pennsylvania Historical and Museum Commission. Guide to the historical markers of Pennsylvania, erected by the Pennsylvania Historical and Museum Commission. Fourth edition. Harrisburg : The Commission, 1975.

APA

Pennsylvania Historical and Museum Commission. (1975). Guide to the historical markers of Pennsylvania, erected by the Pennsylvania Historical and Museum Commission. Fourth edition. Harrisburg : The Commission.

Chicago

Pennsylvania Historical and Museum Commission. Guide to the historical markers of Pennsylvania, erected by the Pennsylvania Historical and Museum Commission. Fourth edition. Harrisburg : The Commission, 1975.