http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Title from PDF caption (viewed Jan. 21, 2009).
Mode of access: Internet at the FAA web site. Address as of 1/21/09: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/74a345ccf8eb48a6862569d900744be1/$FILE/ATTNUI98/ac91-48.pdf ; current access available via PURL.
United States. Federal Aviation Administration.