AASHTO transportation glossary. 4th ed. [Washington, D.C.]: American Association of State Highway and Transportation Officials, ©2009. ISBN 9781615830053. Dostupné také z: https://proxy.k.utb.cz/login?url=http://app.knovel.com/hotlink/toc/id:kpAASHTOTD/aashto_transportation_glossary_4th_edition.