Reference: Wheeler 1970

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}
}