Fleeger, G. M., Bushnell, K. O., & Watson, D. W. (2003). Moraine and McConnells Mill State Parks, Butler and Lawrence Counties: Glacial lakes and drainage changes. [Harrisburg, Pa.: Pennsylvania Dept. of Conservation and Natural Resources].

Fleeger, Gary M., Kent O. Bushnell, and Donald Whitman Watson. Moraine and McConnells Mill State Parks, Butler and Lawrence Counties: Glacial Lakes and Drainage Changes. [Harrisburg, Pa.: Pennsylvania Dept. of Conservation and Natural Resources], 2003.

Fleeger, Gary M., Kent O. Bushnell, and Donald Whitman Watson. Moraine and McConnells Mill State Parks, Butler and Lawrence Counties: Glacial Lakes and Drainage Changes. [Harrisburg, Pa.: Pennsylvania Dept. of Conservation and Natural Resources], 2003.