[R] Alternative to Numerical Recipes

[Clive Jenkins]

Some time ago I mentioned the online version of the book
"Numerical Recipes in C"
http://www.ulib.org/webRoot/Books/Numerical_Recipes/
and inadvertantly stirred up a hornets' nest.
I obtained from this book code to calculate the Incomplete beta
function. It appears in: 
6.4 Incomplete Beta Function, Student’s Distribution, F-Distribution,
Cumulative Binomial Distribution, p.226,
and it calls the log-gamma function that appears in:
6.1 Gamma, Beta, and Related Functions, p.213.

I wish to attribute this material to its source, but would prefer to
cite a more "respectable" source than Numerical Recipes. Can anyone
suggest the original source, or a source of something very similar, or a
better place to ask the question?

Thanks,
Clive Jenkins

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