1. Abramowitz, M., and I.A. Stegun. 1964. Handbook of mathematical functions with formulas, graphs, and mathematical tables. National Bureau of Standards, Applied Mathematics Series 55
2. Aitchinson, J., and J.A.C. Brown. 1957. The Lognormal Distribution. Cambridge University Press, London.
3. Allmaras, R.R., R.E. Burwell, W.B. Voorhees, and W.E. Larson. 1965. Aggregate size distribution in the row zone of tillage experiments. Soil Sci. Soc. Am. Proc. 29: 645–650.
4. Atlas, R.M., and R. Bartha. 1987. Microbiol Ecology; Fundamentals and Applications. Benjamin/Cummings Publishing Co., Menlo Park, CA
5. Barnett, V. 1973. Comparative Statistical Inference. Wiley, New York.