May-Collado, L., Gerrodette, T., Calambokidis, J., Rasmussen, K. y Sereg, I. (2005) «Patterns of cetacean sighting distribution in the Pacific Exclusive Economic Zone of Costa Rica based on data collected from 1979-2001», Revista de Biología Tropical, 53(1-2), pp. 249–263. doi: 10.15517/rbt.v53i1-2.14556.