Di Stefano, E.; Sprovieri, R. (1991): Calcareous plankton biostratigraphy of ODP Leg 107 Site 651, uppermost Pliocene - lower Pleistocene. Societa Geologica Italiana, Rome, Italy, In: Cita, Maria Bianca (editor), Geology of the oceans, 44, 157-165, georefid:1994-052705