Setyawati, Siti Mukhlisoh, et al. “The Diversity of the Dragonfly of Orthetrum Genus in Protected Area of Mount Prau, Central Java Indonesia”. Journal of Natural Sciences and Mathematics Research, vol. 3, no. 1, June 2017, pp. 228-35, https://journal.walisongo.ac.id/index.php/JNSMR/article/view/1747.