1.Methods of Soil Analysis. Part 2. Microbiological and Biochemical Properties (Soil Science Society of America Book, No 5) (Soil Science Society of America Book Series) by R. W. Weaver, Scott Angle, Peter Bottomley and David Bezdiecek (Jan 1, 1994)
2.Methods of Soil Analysis. Part 3. Chemical Methods (Soil Science Society of America Book Series, No. 5) by Donald L. Sparks (1996)
3.Methods of Soil Analysis. Part 4. Physical Methods (Soil Science Society of America Book Series, Vol. 5) Jacob H. Dane, Clarke Topp (1986)