Kendall, M. G., Buckland, W. R., & Marriott, F. H. C. (1989). Dictionary of statistical terms (5th ed.). Published for the International Statistical Institute by Longman Scientific & Technical ; Wiley.

Kendall, Maurice G., William R. Buckland, и F. H. C. Marriott. Dictionary of Statistical Terms. 5th ed. Burnt Mill, Harlow, Essex, England : New York: Published for the International Statistical Institute by Longman Scientific & Technical ; Wiley, 1989.

Kendall, Maurice G., et al. Dictionary of Statistical Terms. 5th ed. Published for the International Statistical Institute by Longman Scientific & Technical ; Wiley, 1989.