1. letswaart, J. H. 1980.A taxonomic revision of the genus Origanum (Labiatae)., Vol. 4, 40–41. 54–55. The Hague: Leiden Botanical Series Leiden University Press.
2. Greuter, W., Burdet, H. M., Long, G. and Med-Checklist. 1986.A critical inventory of vascularplants of the circummediterranean countries. Dicotyledones (Convolvulaceae Labiateae), Vol. 3, 305307Berlin: Botanischer Garten und Botanischer Museum. Conservatoire et Jardin botaniques, Geneve. Med-Checklist trust of OPTIMA
3. Halacsy, E. 1902–1904.Conspectus Florae Graecae., Vol. 2–3, 553Lipsiae (Leipzig): Sumptibus Guilelmi Engelman. (supplemment in 1908, second supplement in 1912), (Reprint 1969 by Verlag J. Cramer)