Caldwell, M. W.; Nydam, R. L.; Palci, A.; Apesteguía, S. N. (2015). «The oldest known snakes from the Middle Jurassic-Lower Cretaceous provide insights on snake evolution». Nature Communications6: 5996. Bibcode:2015NatCo...6.5996C. PMID25625704. doi:10.1038/ncomms6996.
Alessandro Palci; Michael W. Caldwell (2010a). «Redescription of Acteosaurus tommasinii von Meyer, 1860, and a discussion of evolutionary trends within the clade Ophidiomorpha». Journal of Vertebrate Paleontology30 (1): 94-108. doi:10.1080/02724630903409139.
Caldwell, Michael W.; Palci, Alessandro (2010). «A new species of marine ophidiomorph lizard,Adriosaurus skrbinensis, from the Upper Cretaceous of Slovenia». Journal of Vertebrate Paleontology30 (3): 747-755. doi:10.1080/02724631003762963.
Caldwell, M. W.; Nydam, R. L.; Palci, A.; Apesteguía, S. N. (2015). «The oldest known snakes from the Middle Jurassic-Lower Cretaceous provide insights on snake evolution». Nature Communications6: 5996. Bibcode:2015NatCo...6.5996C. PMID25625704. doi:10.1038/ncomms6996.
Caldwell, M. W.; Nydam, R. L.; Palci, A.; Apesteguía, S. N. (2015). «The oldest known snakes from the Middle Jurassic-Lower Cretaceous provide insights on snake evolution». Nature Communications6: 5996. Bibcode:2015NatCo...6.5996C. PMID25625704. doi:10.1038/ncomms6996.