المؤلفون: Whannel, Garry

المصدر: The Annals of the American Academy of Political and Social Science, 2009 Sep 01. 625, 205-218.

الوصول الحر: https://www.jstor.org/stable/40375916Test

المؤلفون: Jackson, David A.

المصدر: Journal of the Royal Statistical Society. Series D (The Statistician), 1994 Jan 01. 43(2), 309-315.

الوصول الحر: https://www.jstor.org/stable/2348346Test

المؤلفون: Davis, Parke H.

المصدر: The North American Review, 1930 Nov 01. 230(5), 549-554.

الوصول الحر: https://www.jstor.org/stable/25113687Test