1. Methods of Soil Analysis, Part 1, 2nd ed., American Society of Agronomy-Soil Science Society of America, Madison, WI 1986.
2. Handbook of Moisture Determination and Control, Vol. 3, Marcel Dekker, New York 1975.
3. An Evaluation of Instruments to Measure Soil Moisture Condition, M. S. Thesis, Texas Tech University, Lubbock, TX, 1991.
4. The Nature and Properties of Soils, 10th ed., Macmillan, New York, 1990.
5. Direct Methods of Soil Moisture Estimation for Water Balance Purposes, Report No. 14, World Meteorological Organization, Series No. 286, Geneva, Switzerland, 1971.