Cita APA (7th ed.)

SpringerLink (Online service), Shukla, G., & Varma, A. (2011). Soil enzymology. Springer Berlin Heidelberg Imprint: Springer.

Cita Chicago (17th ed.)

SpringerLink (Online service), Girish Shukla, i Ajit Varma. Soil Enzymology. Berlin, Heidelberg: Springer Berlin Heidelberg Imprint: Springer, 2011.

Cita MLA (9th ed.)

SpringerLink (Online service), et al. Soil Enzymology. Springer Berlin Heidelberg Imprint: Springer, 2011.