Pennsylvania Turnpike system.

Chicago citation style
Pennsylvania Turnpike Commission. Pennsylvania Turnpike system.. Retrieved from the Digital Public Library of America, https://archive.org/details/pennsylvaniaturn00penn_5. (Accessed December 13, 2018.)
APA citation style
Pennsylvania Turnpike Commission, Pennsylvania Turnpike system.. Retrieved from the Digital Public Library of America, https://archive.org/details/pennsylvaniaturn00penn_5
MLA citation style
Pennsylvania Turnpike Commission. Retrieved from the Digital Public Library of America <https://archive.org/details/pennsylvaniaturn00penn_5>.
Note: These citations are programmatically generated and may be incomplete.