APA (7th ed.) Citation

Hromadka, T. V., & Yen, C. C. (1987). A diffusion hydrodynamic model. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hromadka, Theodore V., and C. C. Yen. A Diffusion Hydrodynamic Model. Denver, Colorado: U.S. Geological Survey, 1987.

MLA (9th ed.) Citation

Hromadka, Theodore V., and C. C. Yen. A Diffusion Hydrodynamic Model. U.S. Geological Survey, 1987.