W. Maciak. Exact null distribution for n≤25 and probability approximations for Spearman’s score in an absence of ties. „Journal of Nonparametric statistics”. Vol 21 No. 1 (January 2009). s. 113–133. DOI: 10.1080/10485250802401038.
google.pl
books.google.pl
Paul W. Mielke, Kenneth J. Berr: Permutation Methods: A Distance Function Approach. Springer, 2001, s. 140. ISBN 0-387-98882-3. [1].
nottingham.ac.uk
psychology.nottingham.ac.uk
Peter Bibby: Nonparametric Tests of Trend. School of Psychology; University of Nottingham. [dostęp 2008-05-29]. [zarchiwizowane z tego adresu (2004-06-22)]. (ang.).
Peter Bibby: Nonparametric Tests of Trend. School of Psychology; University of Nottingham. [dostęp 2008-05-29]. [zarchiwizowane z tego adresu (2004-06-22)]. (ang.).