Zikmundová, Martina - Valíček, P. - Vaněk, Tomáš
Content substances in the species .I.Codonopsis pilosula./I. (Franch.) Nannf. Under the conditions of Czech Republic. I.Water soluble substances.
Agricultura Tropica et Subtropica. Praha: Institute of Tropical and Subtropical Agriculture, 1998, s. 23-28. 31. ISBN 80-213-0441-3
http://hdl.handle.net/11104/0088867