"PHMC Historical Markers Search". Pennsylvania Historical and Museum Commission. Commonwealth of Pennsylvania. Diarsipkan dari versi asli(Searchable database) tanggal 2016-03-21. Diakses tanggal 2014-01-25.
"PHMC Historical Markers Search". Pennsylvania Historical and Museum Commission. Commonwealth of Pennsylvania. Diarsipkan dari versi asli(Searchable database) tanggal 2016-03-21. Diakses tanggal 2014-01-25.