Ergative case is the case of nouns in ergative-absolutive languages that would generally be the subjects of transitive verbs in the translation equivalents of nominative-accusative languages such as English.
Ergative case is more likely to be formally marked on the noun than absolutive case is.
Pei, Mario A., and Frank Gaynor. 1954.A dictionary of linguistics. New York: Philosophical Library.
Hartmann, R.R.K., and F.C. Stork. 1972.Dictionary of language and linguistics. London: Applied Science.
Crystal, David. 1980.A first dictionary of linguistics and phonetics. Boulder, CO: Westview.
Andrews, Avery. 1985. "The major functions of the noun phrase." In Shopen 1985b