1. Chatfield, C., and Goodhardt, G. (1975) Results Concerning Brand Choice, Journal of Marketing Research, 12, 110–113.
2. Choi, S.C. and Wette, R. (1967) Maximum Likelihood Estimation of the Parameters of the Gamma Distribution and Their Bias, Technometrices, 11, 683–689.
3. Fielitz, B.D. and Myers, B.L. (1976) Estimation of Parameters in the Beta Distribution, Decision Sciences, 7, 1–13.
4. Graybill, F.A. (1983) Matrices with Applications in Statistics, Second Edition. Belmont, California: Wadsworth, Inc.
5. Griffiths, P. and Hill, I.D. (1985) Applied Statistics Algorithms. Chichester: Ellis Horwood.