# Where can I get reference formulas for truncated distributions?

I have been comparing tails of various distributions for an application where we will need the conditional expectation of the tail or a truncated tail:

$E(X | a<X \leq b )= \frac{\int_a^b x f(x) dx}{F(b) - F(a)}$

There is some limited information out there on the web [such as http://en.wikipedia.org/wiki/Truncated_normal_distribution ], and I am capable of carrying out the integrals with difficulty, but ideally I would like to see worked-out formulas and approximations for the major continuous distributions. Is there a good reference work I am missing?

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