Leggette, R. M., Foster, M. D., Lamar, W. L., & Love, S. K. (1936). Ground water in northwestern Pennsylvania. Harrisburg: Pa. Dept. of Internal Affairs, Topographic and Geologic Survey.
Παραπομπή Chicago StyleLeggette, Ralph Maxwell, Margaret Dorothy Foster, William Luther Lamar, and Samuel Kenneth Love. Ground Water in Northwestern Pennsylvania. Harrisburg: Pa. Dept. of Internal Affairs, Topographic and Geologic Survey, 1936.
Παραπομπή MLALeggette, Ralph Maxwell, Margaret Dorothy Foster, William Luther Lamar, and Samuel Kenneth Love. Ground Water in Northwestern Pennsylvania. Harrisburg: Pa. Dept. of Internal Affairs, Topographic and Geologic Survey, 1936.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.