Pułaski, Łukasz. “Plants from the Orchid Family (Orchidaceae) in the Częstochowa Upland (south-Central Poland)”. Acta Universitatis Lodziensis. Folia Biologica Et Oecologica, vol. 1, Jan. 2002, pp. 95-104, doi:10.18778/1730-2366.01.05.