Barbara F. Grimes; Richard Saunders Pittman; Joseph Evans Grimes, penyunting (1974). Ethnologue (dalam bahasa Inggeris). Wycliffe Bible Translators. Dicapai pada 13 Julai 2014.
Lewis, M. Paul & Gary F. Simons. 2010. Assessing Endangerment: Expanding Fishman’s GIDS. Revue Roumaine de linguistique 55(2). 103–120. Online versionDiarkibkan 2015-12-27 di Wayback Machine
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Lewis, M. Paul & Gary F. Simons. 2010. Assessing Endangerment: Expanding Fishman’s GIDS. Revue Roumaine de linguistique 55(2). 103–120. Online versionDiarkibkan 2015-12-27 di Wayback Machine