MLA

Ritz, Christian, et al. Nonlinear Regression with R. Springer New York, 2008.

APA

Ritz, C., Gentleman, R., Hornik, K., Streibig, J. C, Streibig, J. Carl, & Parmigiani, G. (2008). Nonlinear Regression with R. Springer New York.

Chicago

Ritz, Christian, Robert Gentleman, Kurt Hornik, Jens C Streibig, Jens Carl Streibig, and Giovanni Parmigiani. Nonlinear Regression with R. : Springer New York, 2008.