APA

Paul E., Clark F., .Soil Microbiology and Biochemistry. London: Academic Press.

Chicago

Paul E.A, Clark F.E, .Soil Microbiology and Biochemistry. London: Academic Press.

Harvard

Paul E., Clark F., .Soil Microbiology and Biochemistry. London: Academic Press.

MLA

Paul E.A, Clark F.E, .London: Academic Press. .