APA (7th ed.) Citation

Ritchey, J. D., & Rumbaugh, J. O. (1996). Subsurface fluid-flow (ground water and vadose zone) modeling. ASTM.

Chicago Style (17th ed.) Citation

Ritchey, Joseph D., and James O. Rumbaugh. Subsurface Fluid-flow (ground Water and Vadose Zone) Modeling. West Conshohocken, P.A: ASTM, 1996.

MLA (9th ed.) Citation

Ritchey, Joseph D., and James O. Rumbaugh. Subsurface Fluid-flow (ground Water and Vadose Zone) Modeling. ASTM, 1996.