A. Vargas, José, and Sylvia Solano. 2011. “On Mellitella Stokesii and Amphipholis Geminata (Echinodermata), from an Intertidal Flat in the Upper Gulf of Nicoya Estuary, Pacific, Costa Rica”. Revista De Biología Tropical 59 (1):193–198. https://doi.org/10.15517/rbt.v59i1.3189.