Gaya APA

FREUND, J, E., WALPOLE, R, E. (1987). Mathematical statistics (4th. ed). Englewood Cliffs, N.J: Prentice-Hall.

Gaya MLA

FREUND, John, E., WALPOLE, Ronald, E.. "Mathematical statistics". 4th. ed Englewood Cliffs, N.J: Prentice-Hall, 1987. Buku.