Citing R

I know that this general question has been asked before, but I have
encountered a picky reviewer.  In the 'standard' reference for R:

R. Gentleman and R. Ihaka (1997). "The R language", In Proceedings of
the 28th Symposium on the Interface, L. Billard and N. Fisher Eds. The
Interface Foundation of North America.

is there a geographical location for the publisher and perhaps
pagination?  Or is this an electronic document?
Thanks

Jim

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