Stanich, Nicholas; Gar W. Rothwell, and Ruth A. Stockey (2009). Phylogenetic diversification of Equisetum (Equisetales) inferrred from Lower Cretaceous species of British Columbia, Canada. American Journal of Botany. 96 (7): 1289—1299. doi:10.3732/ajb.0800381. {{cite journal}}: |access-date= вимагає |url= (довідка)
