Böhm, Alexander, Daniela Bartel, Nikolaus Urban Szucsich, and Günther Pass. 2011. “Confocal Imaging of the Exo- and Endoskeleton of Protura After Nondestructive DNA Extraction”. Soil Organisms 83 (3): 335–345. https://soil-organisms.org/index.php/SO/article/view/255.