PARZYCH, Agnieszka and SOBISZ, Zbigniew. Preliminary ecology research on Epipactis atrorubens (Hoffm.) Besser on the Słowińskie Coast (Northern Poland). Ecological Questions. Online. 8 April 2014. Vol. 18, p. 21 – 32. [Accessed 4 July 2025]. DOI 10.12775/ecoq-2013-0002.