Spongberg, Alison L. “PCB Concentrations in Sediments from the Gulf of Nicoya Estuary, Pacific Coast of Costa Rica”. Revista de Biología Tropical 52, no. S2 (December 1, 2004): 11–22. Accessed May 18, 2024. https://www.revistas.ucr.ac.cr/index.php/rbt/article/view/26572.