Occurrence of flavonoids in Ophrys (Orchidaceae) flower parts. Anastasia Karioti, Christine K. Kitsaki, Stella Zygouraki, Marouska Ziobora, Samah Djeddi, Helen Skaltsa and Georgios Liakopoulos, Flora – Morphology, Distribution, Functional Ecology of Plants, Volume 203, Issue 7, 1 October 2008, Pages 602–609, doi:10.1016/j.flora.2007.09.009
Osiadacz, B. & Kreciala, M. (2014). Ophrys apifera Huds. (Orchidaceae), a new orchid species to the flora of Poland. Biodiversity Research and Conservation, 36, 11–16. doi:10.2478/biorc-2014-0027
Sandal Erzurumlu, G., Tuluhan Yilmaz, K., & Sogut, Z. (2017). A regional scale evaluation of conservation status of orchid species recorded in the eastern Mediterranean region of Turkey. Turkish Journal of Agriculture– Food Science and Technology, 5(9), 996–1001. doi:10.24925/turjaf.v5i9.999-1001.1233