Barquero González, J. P.; Cabrera Alvarado, A. A.; Vallejo Cubero, S.; Monge Nájera, J.; Morera Brenes, B. The Geographic Distribution of Costa Rican Velvet Worms (Onychophora: Peripatidae). Rev. Biol. Trop. 2016, 64, 1401–1414.