Gaya APA

Krause, A., Olson, M. (2005). The Basics of S-PLUS (4th ed. 2005.). New York: Springer.

Gaya MLA

Krause, Andreas.., Olson, Melvin.. "The Basics of S-PLUS". 4th ed. 2005. New York: Springer, 2005. E Book.