Gehring, R. E. (1978). Basic behavioral statistics. Hougton mifflin.
Cita Chicago (17th ed.)Gehring, Robert E. Basic Behavioral Statistics. Boston: Hougton mifflin, 1978.
Cita MLA (9th ed.)Gehring, Robert E. Basic Behavioral Statistics. Hougton mifflin, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.