APA (7th ed.) Citation

Paul, E. A., & Clark, F. G. (1989). Soil microbiology and biochemistry. Academic.

Chicago Style (17th ed.) Citation

Paul, Eldor Alvin, and F. G. Clark. Soil Microbiology and Biochemistry. San Diego: Academic, 1989.

MLA (9th ed.) Citation

Paul, Eldor Alvin, and F. G. Clark. Soil Microbiology and Biochemistry. Academic, 1989.