APA (7th ed.) Citation

Van Tuyl, D. W., Klein, N. H., & Leggette, R. M. (1951). Ground-water resources of Beaver County, Pennsylvania. [publisher not identified].

Chicago Style (17th ed.) Citation

Van Tuyl, Donald Wells, N. H. Klein, and R. M. Leggette. Ground-water Resources of Beaver County, Pennsylvania. [Harrisburg]: [publisher not identified], 1951.

MLA (9th ed.) Citation

Van Tuyl, Donald Wells, et al. Ground-water Resources of Beaver County, Pennsylvania. [publisher not identified], 1951.