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Victorian Department of Primary Industries (2007). Victorian Resources Online: Hardheads (Russian/Creeping Knapweed) (Acroptilon repens): http://www.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/weeds_herbs_perennial_hardheads Present Distribution of Hardheads (Acroptilon repens) in Victoria. Available at http://www.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/lwm_current_weeds_hardheads2 Potential distribution of Hardheads (Acroptilon repens) in Victoria. Available at http://www.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/lwm_pest_plants_hardheads
Western Australian Department of Agriculture and Food (undated) Declared Plant in Western Australia: Creeping Knapweed (Acroptilon repens; Rhaponticum repens). Available at http://agspsrv95.agric.wa.gov.au/dps/version02/01_plantview.asp?page=1&contentID=23&p1=creeping
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See also: Bottoms, R.M. & Whitson, T.D. (1998). A systems approach for the management of Russian Knapweed (Acroptilon repens). Weed Technology 12: 363-366. Abstract available at http://apt.allenpress.com/perlserv/?request=get-abstract&doi=10.1614%2F0890-037X%281998%29012%5B0363%3ASSAFTM%5D2.3.CO%3B2
California Department of Food and Agriculture (2008). Encycloweedia Data Sheet: Russian Knapweed (Acroptilon repens (L.) DC.). Available at http://www.cdfa.ca.gov/PHPPS/ipc/weedinfo/acroptilon.htm