Torres, P. L. M., M. C. Michat, and M. Archangelsky. “The Immature Stages of Tropisternus (Pleurhomus) sahlbergi (Sharp) (Coleoptera: Hydrophilidae), With Considerations on the Primary Chaetotaxy of Tropisternus Soliera”. Zootaxa, vol. 2777, no. 1, Feb. 2011, pp. 25–40, doi:10.11646/zootaxa.2777.1.2.