Di Mana Gulma
Amerika Utara | Weed Science Society of America (2010) - Composite List of Weeds |
Eropa | NOBANIS - European Network on Invasive Alien Species |
Kerajaan Inggris & Irlandia | Garden Organic |
Asia Timur | T. Mito & T. Uesugi (2004) - Invasive Alien Species in Japan |
Rusia | AgroAtlas - Interactive Agricultural Atlas of Russia & Neighboring Countries |
Selandia Baru | C. Howell (2008) - Consolidated List of Environmental Weeds in NZ |