Frazer, P. (1880). The geology of Lancaster County: With an atlas. Board of Commissioners for the Second Geological Survey of Pennsylvania.
Chicago-Zitierstil (17. Ausg.)Frazer, Persifor. The Geology of Lancaster County: With an Atlas. Harrisburg: Board of Commissioners for the Second Geological Survey of Pennsylvania, 1880.
MLA-Zitierstil (9. Ausg.)Frazer, Persifor. The Geology of Lancaster County: With an Atlas. Board of Commissioners for the Second Geological Survey of Pennsylvania, 1880.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.