[MathOuvrage]
Theory of point estimation
/ Lehmann, Erich L..
-Pacific Grove CA : Brooks/Cole publishing company, 1991. - xii, 506 p. ; 24 cm
[MathOuvrage]
Sampling techniques
/ Cochran, William G..
-Brisbane, Chichester, New York NY, Singapore, Toronto : John Wiley, 1977. - xvi, 428 p. ; 24 cm