Gaya APA

Walpole, R, E., Freund, J, E. (1987). Mathematical statistics (4th.ed.). Englewood Cliffs: Prentice-Hall.

Gaya MLA

Walpole, Ronald, E.., Freund, John, E.. "Mathematical statistics". 4th.ed. Englewood Cliffs: Prentice-Hall, 1987. Text.