Wheeler, Alva L. 1970. Grammar of the Siona Language, Colombia, South America. University of California at Berkeley dissertation. (197pp.)
http://proquest.umi.com/pqdweb?did=755463181&sid=1&Fmt=1&clientId=56146&RQT=309&VName=PQD
@phdthesis{wheeler1970siona, author = {Alva L. Wheeler}, pages = {197}, publisher = {University of California at Berkeley Ph.D. Dissertation}, 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} }