APA

Williamson A. K., Grubb H. F., .Ground-water flow in the Gulf Coast aquifer systems, south-central United States / |c by Alex K. Williamson and Hayes F. Grubb. Washington, DC : |b U.S. G.P.O. ; |a Denver, CO : |b For sale by the U.S. Geological Survey, Information Services, |c [2001]: .

Chicago

Williamson Alex K, Grubb Hayes F, .Ground-water flow in the Gulf Coast aquifer systems, south-central United States / |c by Alex K. Williamson and Hayes F. Grubb. Washington, DC : |b U.S. G.P.O. ; |a Denver, CO : |b For sale by the U.S. Geological Survey, Information Services, |c [2001]: .

Harvard

Williamson A. K., Grubb H. F., .Ground-water flow in the Gulf Coast aquifer systems, south-central United States / |c by Alex K. Williamson and Hayes F. Grubb. Washington, DC : |b U.S. G.P.O. ; |a Denver, CO : |b For sale by the U.S. Geological Survey, Information Services, |c [2001]: .

MLA

Williamson Alex K, Grubb Hayes F, .Washington, DC : |b U.S. G.P.O. ; |a Denver, CO : |b For sale by the U.S. Geological Survey, Information Services, |c [2001]: . .