Paul, E. A., & Clark, F. E. (1989). Soil microbiology and biochemistry. Academic Press.
Lua i Stíl Chicago (17ú heag.)Paul, Eldor Alvin, agus F. E. Clark. Soil Microbiology and Biochemistry. San Diego, Calif: Academic Press, 1989.
Lua MLA (9ú heag.)Paul, Eldor Alvin, agus F. E. Clark. Soil Microbiology and Biochemistry. Academic Press, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.