APA

Jorgensen D. G., Helgesen J. O. & Imes J. L. (1993). Regional Aquifers in Kansas, Nebraska, and Parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming - Geohydrologic Framework. Washington: United States Government Printing Office.

Chicago

Jorgensen Donald G, Helgesen John O and Imes Jeffrey L. 1993. Regional Aquifers in Kansas, Nebraska, and Parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming - Geohydrologic Framework. Washington: United States Government Printing Office.

Harvard

Jorgensen D. G., Helgesen J. O. and Imes J. L. (1993). Regional Aquifers in Kansas, Nebraska, and Parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming - Geohydrologic Framework. Washington: United States Government Printing Office.

MLA

Jorgensen Donald G, Helgesen John O and Imes Jeffrey L. Regional Aquifers in Kansas, Nebraska, and Parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming - Geohydrologic Framework. Washington: United States Government Printing Office. 1993.