Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·

Ethnologue: Languages of the World, 16th Edition (2009) . (2009) · edited by M. Paul Lewis · SIL International http://www.ethnologue.com/

A computational analysis of Gabon varieties ( pp. 3-17 ) . Bart Alewijnse and John Nerbonne and Lolke J. van der Veen and Franz Manni (2007) · In Proceedings of the RANLP (Recent Advances in Natural Language Processing) workshop on computational phonology edited by Osenova, Petya and others · http://www.ddl.ish-lyon.cnrs.fr/fulltext/Van%%20Der%%20Veen/Alewijnse_2007.pdf