www.chmelarstvi.cz (Chmelarstvi, druzstvo Zatec)
www.chizatec.cz (Hop research institute)
www.ukzuz.cz (UKZUZ)
www.bohemiahop.cz (Bohemia Hop, a.s.)
www.hop.cz ( Top Hop)
www.zhc.cz ( Zatec Hop Company)
www.hmelj-giz.si/ihgc (International Hop Growers Convention)
www.johbarth.com (Barth)
www.hopsteiner.com (Steiner)
http://muzeum.chmelarstvi.cz (Hop museum)
www.czhops.cz/tc (Technická komise IHGC)

www.mze.cz (Ministry of Agriculture of the Czech Republic)

www.ukzuz.cz (Central Institute for Supervising and Testing in Agriculture)