MLA

Back, Nathan, et al. Biosurfactants. Springer New York, 2010.

APA

Back, N., Cohen, I. R, Sen, R., & Lajtha, A. (2010). Biosurfactants. Springer New York.

Chicago

Back, Nathan, Irun R Cohen, Ramkrishna Sen, and Abel Lajtha. Biosurfactants. : Springer New York, 2010.