Ozkan, Mustafa, Kamuran Aktas, Canan Ozdemir, and Greg Guerin. 2009. “Nutlet Morphology and Its Taxonomic Utility in Salvia (Lamiaceae: Mentheae) from Turkey”. Acta Botanica Croatica 68 (1). https://www.abc.botanic.hr/index.php/abc/article/view/76.