APA (7th ed.) Citation
Beyer, G. R. (1991). Guide to the state historical markers of Pennsylvania (Fifth edition.). Pennsylvania Historical and Museum Commission.
Chicago Style (17th ed.) Citation
Beyer, George R. Guide to the State Historical Markers of Pennsylvania. Fifth edition. Harrisburg: Pennsylvania Historical and Museum Commission, 1991.
MLA (9th ed.) Citation
Beyer, George R. Guide to the State Historical Markers of Pennsylvania. Fifth edition. Pennsylvania Historical and Museum Commission, 1991.
Warning: These citations may not always be 100% accurate.