McGregor, William B. 2010. Optional ergative case marking systems in a typological-semiotic perspective. Lingua 120(7). 1610–1636. Elsevier.
@article{mcgregor2010optional, author = {McGregor, William B}, journal = {Lingua}, number = {7}, pages = {1610–1636}, publisher = {Elsevier}, title = {Optional ergative case marking systems in a typological-semiotic perspective}, volume = {120}, year = {2010} }