lmer, p-values and all that

Dear Colleagues,

 	Regarding Douglas Bates' cogent explanation of why lmer doesn't
return p-values, available at
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/76742.html ...could anybody
cite for me a published version of this explanation, or a paper in which
this explanation is put forth formally? I would like to mention this briefly
and cite something in a paper I am currently writing, but am wary about
citing a mailing list post in a paper.

Thanks in advance,
Adam