Cipola, Nikolas G., and Aron D. Katz. “Morphological and Molecular Analysis of Willowsia Nigromaculata (Collembola, Entomobryidae, Entomobryinae) Reveals a New Cryptic Species from the United States”. European Journal of Taxonomy 739, no. 1 (March 16, 2021): 92-116. Accessed September 24, 2021. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/1269.