http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Voluntary initiatives for sustainable tourism
worldwide inventory and comparative analysis of 104 eco-labels, awards and self-commitments
159 σ.; εικ.; 30 εκ.+ 1 οπτική δισκέτα λέιζερ Η/Υ (4 3/4 ίν.)