Baumgartner-Mora, Claudia, Peter O. Baumgartner, y Pascal Tschudin. «Late Oligocene Larger Foraminifera From Nosara (Nicoya Península, Costa Rica) and Indward (Carriacou, Lesser Antilles), Calibrated by 87sr/ 86sr Isotope Stratigraphy». Revista geológica de América central 38 (marzo 24, 2007). Accedido abril 7, 2025. https://revistas.ucr.ac.cr/index.php/geologica/article/view/4215.