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Wible, J. R.; Rougier, G. W.; Novacek, M. J.; Asher, R. J. (2007). "Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary". Nature447 (7147): 1003–1006. doi:10.1038/nature05854. பப்மெட்:17581585. Bibcode: 2007Natur.447.1003W.
Ji, Q.; Luo, Z-X.; Yuan, C-X.; Wible, J.R.; Zhang, J-P.; Georgi, J.A. (April 2002). "The earliest known eutherian mammal". Nature416 (6883): 816–822. doi:10.1038/416816a. பப்மெட்:11976675. Bibcode: 2002Natur.416..816J.
Wible, J. R.; Rougier, G. W.; Novacek, M. J.; Asher, R. J. (2007). "Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary". Nature447 (7147): 1003–1006. doi:10.1038/nature05854. பப்மெட்:17581585. Bibcode: 2007Natur.447.1003W.
Ji, Q.; Luo, Z-X.; Yuan, C-X.; Wible, J.R.; Zhang, J-P.; Georgi, J.A. (April 2002). "The earliest known eutherian mammal". Nature416 (6883): 816–822. doi:10.1038/416816a. பப்மெட்:11976675. Bibcode: 2002Natur.416..816J.
Wible, J. R.; Rougier, G. W.; Novacek, M. J.; Asher, R. J. (2007). "Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary". Nature447 (7147): 1003–1006. doi:10.1038/nature05854. பப்மெட்:17581585. Bibcode: 2007Natur.447.1003W.