http://www.faa.gov/ats/ato/rvsm_documentation.htm
Bit less than halfway down is "Documents Applicable to All RVSM Approvals" where the first link is to 'Guidance 91--RVSM.' Front page of this word doc has some useful references regarding RVSM.
For ETOPS,
ICAO Annex 6, p. I, ch 4, para 4.7 along with Attachment E to p. I.