APA (7th ed.) Citation

Pettijohn, R. A., & Chen, H. (1984). Hydrologic analysis of the High Plains aquifer system in Box Butte County, Nebraska. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Pettijohn, Robert A., and Hsiu-Hsiung Chen. Hydrologic Analysis of the High Plains Aquifer System in Box Butte County, Nebraska. [Reston, Virginia?]: U.S. Geological Survey, 1984.

MLA (9th ed.) Citation

Pettijohn, Robert A., and Hsiu-Hsiung Chen. Hydrologic Analysis of the High Plains Aquifer System in Box Butte County, Nebraska. U.S. Geological Survey, 1984.