APA (7th ed.) Citation

Kent, B. H., Schweinfurth, S. P., & Roen, J. B. (1969). Geology and land use in eastern Washington County, Pennsylvania. [publisher not identified].

Chicago Style (17th ed.) Citation

Kent, Bion H., Stanley P. Schweinfurth, and John B. Roen. Geology and Land Use in Eastern Washington County, Pennsylvania. Harrisburg: [publisher not identified], 1969.

MLA (9th ed.) Citation

Kent, Bion H., et al. Geology and Land Use in Eastern Washington County, Pennsylvania. [publisher not identified], 1969.