APA

Bardgett R. D., . (2005). The biology of soil. New York: Oxford University Press.

Chicago

Bardgett Richard D, . 2005. The biology of soil. New York: Oxford University Press.

Harvard

Bardgett R. D., . (2005). The biology of soil. New York: Oxford University Press.

MLA

Bardgett Richard D, . The biology of soil. New York: Oxford University Press. 2005.