Navarro, T., J. L. Rosua, and J. F. Mota. “Systematical Study of the Taxa of the Polium Series, Genus Teucrium L. In the Betic Mountain Ranges”. Acta Botanica Malacitana, vol. 15, Dec. 1990, pp. 79-89, doi:10.24310/abm.v15i.9296.