Analysis of information sources in references of the Wikipedia article "Bias of an estimator" in English language version.
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: CS1 maint: date and year (link) Van der Vaart, H. R. (June 1961). "Some Extensions of the Idea of Bias". The Annals of Mathematical Statistics. 32 (2): 436–447.{{cite journal}}
: CS1 maint: date and year (link) Pfanzagl, Johann (1994). Parametric Statistical Theory. Walter de Gruyter.{{cite journal}}
: CS1 maint: date and year (link) Van der Vaart, H. R. (June 1961). "Some Extensions of the Idea of Bias". The Annals of Mathematical Statistics. 32 (2): 436–447.{{cite journal}}
: CS1 maint: date and year (link) Pfanzagl, Johann (1994). Parametric Statistical Theory. Walter de Gruyter.