Philip A. Meyers and Michela Arnaboldia (2008). "Paleoceanographic implications of nitrogen and organic carbon isotopic excursions in mid-Pleistocene sapropels from the Tyrrhenian and Levantine Basins, Mediterranean Sea". Palaeogeography, Palaeoclimatology, Palaeoecology. 266 (1–2): 112–118. Bibcode:2008PPP...266..112M. doi:10.1016/j.palaeo.2008.03.018.
Philip A. Meyers and Michela Arnaboldia (2008). "Paleoceanographic implications of nitrogen and organic carbon isotopic excursions in mid-Pleistocene sapropels from the Tyrrhenian and Levantine Basins, Mediterranean Sea". Palaeogeography, Palaeoclimatology, Palaeoecology. 266 (1–2): 112–118. Bibcode:2008PPP...266..112M. doi:10.1016/j.palaeo.2008.03.018.