Siegel S and Castellan Jr. N.J. Nonparametric Statistics for the Behavioral Sciences (1988)
International Edition. McGraw-Hill Book Company New York. ISBN 0-07-057357-3 p. 262-272
Siegel S and Castellan Jr. N.J. Nonparametric Statistics for the Behavioral Sciences (1988)
International Edition. McGraw-Hill Book Company New York. ISBN 0-07-057357-3 Table T. Critical
values for Kendall coefficient of concordance W p. 365