Wheeler, Alva L. 1970. Grammar of the Siona Language, Colombia, South America. (Doctoral dissertation, University of California at Berkeley; 197pp.)
http://proquest.umi.com/pqdweb?did=755463181&sid=1&Fmt=1&clientId=56146&RQT=309&VName=PQD
@phdthesis{gWheelerSiona, author = {Wheeler, Alva L.}, pages = {197}, school = {University of California at Berkeley}, title = {Grammar of the Siona Language, Colombia, South America}, url = {http://proquest.umi.com/pqdweb?did=755463181&sid=1&Fmt=1&clientId=56146&RQT=309&VName=PQD}, year = {1970} }