2 literature references for Rattus hainaldi Kitchener, How, and Maharadatunkamsi, 1991:

Author: Wilson, Don E., and DeeAnn M. Reeder, eds.
Year: 1992
Title:
Source: Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing
Author:
Year: 1998
Title:
Source: website, Mammal Species of the World