Goudswaard, Nelleke. 2005. The Begak (Ida'an) Language of Sabah. 107. (Doctoral dissertation, Vrije Universiteit Amsterdam; xix+520pp.)
http://www.lotpublications.nl/publish/issues/Goudswaard/index.html
@phdthesis{gGoudswaardBegak, address = {Utrecht}, author = {Goudswaard, Nelleke}, pages = {xix+520}, school = {Vrije Universiteit Amsterdam}, series = {LOT Dissertation Series}, title = {The Begak (Ida'an) Language of Sabah}, url = {http://www.lotpublications.nl/publish/issues/Goudswaard/index.html}, volume = {107}, year = {2005} }