original description
(of Julus rufifrons C. L. Koch, 1847) Koch, C.L. (1847). Den Verzeichnissen und Berichtigungen zu Deutschlands Crustaceen, Myriapoden und Arachniden und ein System der Myriapoden. [The lists and corrections to Germany's crustaceans, myriapods and arachnids and a system of the myriapods.]. <em>In: Panzer, G.W.F. & Herrich-Schäffer, A. (eds.), Kritische Revision der Insectenfaune Deutschlands.</em> 3: 1-272, pls. 1-10., available online at http://biodiversitylibrary.org/page/33700094
page(s): 108 [details] 
additional source
Kime, R. D.; Enghoff, H. (2017). Atlas of European millipedes 2: Order Julida (Class Diplopoda). <em>European Journal of Taxonomy.</em> 346: 1–299., available online at https://doi.org/10.5852/ejt.2017.346
page(s): 69 [details]
From editor or global species database