Cita APA (7a ed.)

Helms, L. L. (1997). Introduction to probability theory: With contemporary applications. W.H. Freeman.

Cita Chicago Style (17a ed.)

Helms, L. L. Introduction to Probability Theory: With Contemporary Applications. New York: W.H. Freeman, 1997.

Cita MLA (9a ed.)

Helms, L. L. Introduction to Probability Theory: With Contemporary Applications. W.H. Freeman, 1997.