Genul Rattus conține 64 de specii. S-a propus o nouă împărțire a speciilor din acest gen, dar aceasta nu cuprinde toate speciile incluse. Aceste grupuri sunt:
Barnett, S. Anthony (2002) The Story of Rats: Their Impact on Us, and Our Impact on Them, Allen & Unwin, Crows Nest, NSW, 202 pages, ISBN 1-86508-519-7.
Hendrickson, R. (1983) More Cunning than Man: A Complete History of the Rat and its Role in Civilization, Kensington Books. ISBN 1-57566-393-7.
Jahn, G. C., P. Cox, S. Mak, and N. Chhorn (1999) "Farmer participatory research on rat management in Cambodia", In G. Singleton, L. Hinds, H. Leirs and Zhibin Zhang [Eds.] Ecologically-based rodent management ACIAR, Canberra. Ch. 17, pp. 358–371. ISBN 1-86320-262-5.
Leung, LKP; Cox, Peter G.; Jahn, G. C.; Nugent, Robert (). „Evaluating rodent management with Cambodian rice farmers”. Cambodian Journal of Agriculture. 5: 21–26.
Musser, G. G. and M. D. Carleton. 1993. "Family Muridae" in D. E. Wilson and D. M. Reeder eds. "Mammal Species of the World a Taxonomic and Geographic Reference", Smithsonian Institution Press, Washington, D.C. pp. 501–755.
Nowak, R. M. (1999) Walker's Mammals of the World Vol. 2. Johns Hopkins University Press, London.
Sullivan, Robert (2004). Rats: A Year with New York's Most Unwanted Inhabitants. Granta Books, London.
Sullivan, Robert (2005). Rats: Observations on the History and Habitat of the City's Most Unwanted Inhabitants. Bloomsbury USA. ISBN 1-58234-477-9.