Website/Catalog  (11 Jun 2015)  
 
http://www.springhillnursery.com/product/blushing_bridesmaid_clematis/vines_climbers

Website/Catalog  (11 Jun 2015)  
 
http://www.thorncroftclematis.co.uk/kaiser.html

Website/Catalog  (11 Jun 2015)  
 
http://www.clematis.com.pl/en/encyklopedia?view=plant&plantid=867

Website/Catalog  (11 Jun 2015)  
 
http://www.clematis.hull.ac.uk/new-clemdetail.cfm?dbkey=3534