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Price, G.D.; Twitchett, R.J.; Smale, C.; Marks, V. (2009). Isotopic analysis of the life history of the enigmatic squid Spirula spirula, with implications for studies of fossil Cephalopods. PALAIOS. 24 (5): 273—279. Bibcode:2009Palai..24..273P. doi:10.2110/palo.2008.p08-067r.
Price, G.D.; Twitchett, R.J.; Smale, C.; Marks, V. (2009). Isotopic analysis of the life history of the enigmatic squid Spirula spirula, with implications for studies of fossil Cephalopods. PALAIOS. 24 (5): 273—279. Bibcode:2009Palai..24..273P. doi:10.2110/palo.2008.p08-067r.