Cita APA (7th ed.)
Freund, J. E. (1973). Modern elementary statistics (4th.). Prentice-Hall.
Cita Chicago (17th ed.)
Freund, John E. Modern Elementary Statistics. 4th. New Jersey: Prentice-Hall, 1973.
Cita MLA (9th ed.)
Freund, John E. Modern Elementary Statistics. 4th. Prentice-Hall, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.