Cita APA (7th ed.)

Williamson, A. K., & Grubb, H. F. (2001). Ground-water flow in the Gulf Coast aquifer systems, south-central United States. U.S. G.P.O. For sale by the U.S. Geological Survey, Information Services.

Cita Chicago (17th ed.)

Williamson, Alex K., i Hayes F. Grubb. Ground-water Flow in the Gulf Coast Aquifer Systems, South-central United States. Washington, DC, Denver, CO: U.S. G.P.O. For sale by the U.S. Geological Survey, Information Services, 2001.

Cita MLA (9th ed.)

Williamson, Alex K., i Hayes F. Grubb. Ground-water Flow in the Gulf Coast Aquifer Systems, South-central United States. U.S. G.P.O. For sale by the U.S. Geological Survey, Information Services, 2001.