Ott, L., & Mendenhall, W. (1985). Understanding Statistics (4th ed.). PWS Publishers.
Cita Chicago (17th ed.)Ott, Lyman, i William Mendenhall. Understanding Statistics. 4th ed. USA: PWS Publishers, 1985.
Cita MLA (9th ed.)Ott, Lyman, i William Mendenhall. Understanding Statistics. 4th ed. PWS Publishers, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.