TIPPETT, L. (1956). Statistics. University Press.
Cita Chicago (17th ed.)TIPPETT, L.H.C. Statistics. London, Oxford: University Press, 1956.
Cita MLA (9th ed.)TIPPETT, L.H.C. Statistics. University Press, 1956.
Atenció: Aquestes cites poden no estar 100% correctes.