Edmunds, W. E., & Berg, T. M. (1973). Geology and mineral resources of the southern half of the Penfield 15-minute quadrangle, Pennsylvania. Pennsylvania Geological Survey.
Chicago Style (17th ed.) CitationEdmunds, William E., and Thomas M. Berg. Geology and Mineral Resources of the Southern Half of the Penfield 15-minute Quadrangle, Pennsylvania. Harrisburg: Pennsylvania Geological Survey, 1973.
MLA (9th ed.) CitationEdmunds, William E., and Thomas M. Berg. Geology and Mineral Resources of the Southern Half of the Penfield 15-minute Quadrangle, Pennsylvania. Pennsylvania Geological Survey, 1973.
Warning: These citations may not always be 100% accurate.