APA (7th ed.) Citation

Richards, S. J., & Hagan, R. M. (1958). Soil moisture tensiometer: How it works, how to use it. Univ. of California.

Chicago Style (17th ed.) Citation

Richards, S. J., and R. M. Hagan. Soil Moisture Tensiometer: How It Works, How to Use It. Berkeley: Univ. of California, 1958.

MLA (9th ed.) Citation

Richards, S. J., and R. M. Hagan. Soil Moisture Tensiometer: How It Works, How to Use It. Univ. of California, 1958.