Parnell, J. R. “Observations on the Fauna Directly Connected With Sedges of the Genus <i>Cyperus</i> in Costa Rica, Central America I. <i>Sibariops confusus</i> (Boh) (Col., Curculionidae) on <i>Cyperus ferax</i≫ L. Rich”. Revista De Biología Tropical, vol. 16, no. 2, Dec. 1968, pp. 247–253, doi:10.15517/rev.biol.trop. v16i2.28153.