Zanella, Ilena, et al. “CHARACTERIZATION OF THE FISHING OF THE HAMMER SHARK, SPHYRNA LEWINI, IN THE EXTERNAL PART OF THE GULF OF NICOYA, COSTA RICA”. Revista Ciencias Marinas Y Costeras, vol. 1, Dec. 2009, pp. 175-9, https://doi.org/10.15359/revmar.1.10.