Good microeconomic textbooks include Robert Pindyck and Daniel Rubinfeld, Microeconomics, Fourth Edition, Prentice Hall, 1998 (see chapters 3-5 on consumer behaviour, including choice under uncertainty); and Michael Katz and Harvey Rosen, Microeconomics, Third Edition, Irwin McGraw Hill, 1998 (See Part 1 on consumer behaviour, including its extension to situations of uncertainty).