Influential observation (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Influential observation" in English language version.

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Everitt, Brian (1998). The Cambridge Dictionary of Statistics. Cambridge, UK New York: Cambridge University Press. ISBN 0-521-59346-8.
Maddala, G. S. (1992). "Outliers". Introduction to Econometrics (2nd ed.). New York: MacMillan. pp. 89. ISBN 978-0-02-374545-4. An outlier is an observation that is far removed from the rest of the observations.

Burt, James E.; Barber, Gerald M.; Rigby, David L. (2009), Elementary Statistics for Geographers, Guilford Press, p. 513, ISBN 9781572304840.
Belsley, David A.; Kuh, Edwin; Welsh, Roy E. (1980). Regression Diagnostics: Identifying Influential Data and Sources of Collinearity. Wiley Series in Probability and Mathematical Statistics. New York: John Wiley & Sons. pp. 11–16. ISBN 0-471-05856-4.
Maddala, G. S. (1992). "Outliers". Introduction to Econometrics (2nd ed.). New York: MacMillan. pp. 89. ISBN 978-0-02-374545-4. An outlier is an observation that is far removed from the rest of the observations.

Grubbs, F. E. (February 1969). "Procedures for detecting outlying observations in samples". Technometrics. 11 (1): 1–21. doi:10.1080/00401706.1969.10490657. An outlying observation, or "outlier," is one that appears to deviate markedly from other members of the sample in which it occurs.