MLA

Varma, Ajit; Oelmüller, Ralf; Oelmüller, Ralf, Ajit Varma, and Ralf Oelmüller. Advanced Techniques In Soil Microbiology. Springer Berlin Heidelberg, 2007.

APA

Varma, R., Varma, A., & Oelmüller, R. (2007). Advanced Techniques in Soil Microbiology. Springer Berlin Heidelberg.

Chicago

Varma, Ajit; Oelmüller, Ralf; Oelmüller, Ralf, Ajit Varma, and Ralf Oelmüller. Advanced Techniques In Soil Microbiology. : Springer Berlin Heidelberg, 2007.