Não informado. (2022). Progress Report. Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Progress Report. Harrisburg, Pa: Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey, 2022.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Progress Report. Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey, 2022.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.