Nougayrol, Pierre. 1999. Les parlers gula: Centrafrique, Soudan, Tchad. Grammaire et lexique. Paris: Centre National de la Recherche Scientifique (CNRS).
@book{Nougayrol-1999, address = {Paris}, author = {Nougayrol, Pierre}, publisher = {Centre National de la Recherche Scientifique (CNRS)}, title = {Les parlers gula: Centrafrique, Soudan, Tchad. Grammaire et lexique}, year = {1999}, iso_code = {glu}, olac_field = {general_linguistics; typology; semantics; morphology; syntax}, wals_code = {gul} }