MLA

Genz, Alan, and Frank Bretz. Computation of Multivariate Normal and T Probabilities. Springer Berlin Heidelberg, 2009.

APA

Genz, A., & Bretz, F. (2009). Computation of Multivariate Normal and t Probabilities. Springer Berlin Heidelberg.

Chicago

Genz, Alan, and Frank Bretz. Computation of Multivariate Normal and t Probabilities. : Springer Berlin Heidelberg, 2009.