↑ Pedersen, H.A. (2006). Systematics and evolution of the Dactylorhiza romana/sambucina polyploid complex (Orchidaceae). Botanical Journal of the Linnean Society 152: 405-434.
↑ Petrova, A.S., Vladimirov, V. & Stoyanov, Y. (2009). Dactylorhiza maculata subsp. transsilvanica (Orchidaceae): new for the Bulgarian flora. Phytologia Balcanica 15: 389-392.
↑ Vladimirov, V., Dane, F., Matevski, V. & Kit Tan (2012). New floristic records in the Balkans: 18. Phytologia Balcanica 18: 69-92.
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