Mari Mutt, J. A. (1981) “Redescription of Willowsia jacobsoni (Borner), an Entomobryid with Conspicuous Sexual Dimorphism (Insecta: Collembola)”, The Journal of Agriculture of the University of Puerto Rico, 65(4), pp. 361–373. doi: 10.46429/jaupr.v65i4.7615.