Brehm, Gunnar. “Revision of the Genus Callipia Guenée, 1858 (Lepidoptera, Geometridae), With the Description of 15 New Taxa”. European Journal of Taxonomy0, no. 404 (February 15, 2018). Accessed April 25, 2024. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/532.