http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Title from PDF file caption (viewed Oct. 21, 2008).
Mode of access: Internet at the FAA web site. Address as of 10/21/08: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/3660756ada0ef1e8862569b500769274/$FILE/AC20-132.pdf ; current access available via PURL.
United States. Federal Aviation Administration.