APA
Sparks D. L., . (1996). Methods of soil analysis Part 3. Chemical methods. U S A: Soil Science Society of America, Inc and American Society of Agronomy, Inc.
Chicago
Sparks D L, . 1996. Methods of soil analysis Part 3. Chemical methods. U S A: Soil Science Society of America, Inc and American Society of Agronomy, Inc.
Harvard
Sparks D. L., . (1996). Methods of soil analysis Part 3. Chemical methods. U S A: Soil Science Society of America, Inc and American Society of Agronomy, Inc.
MLA
Sparks D L, . Methods of soil analysis Part 3. Chemical methods. U S A: Soil Science Society of America, Inc and American Society of Agronomy, Inc. 1996.