Wentzel, E. (1982). Probability theory: First steps. Mir Pub..
Cita Chicago (17th ed.)Wentzel, E.S. Probability Theory: First Steps. Moscow: Mir Pub., 1982.
Cita MLA (9th ed.)Wentzel, E.S. Probability Theory: First Steps. Mir Pub., 1982.
Atenció: Aquestes cites poden no estar 100% correctes.