@article{LaPolla2010,
  author    = {Randy J. LaPolla},
  title     = {Parallel grammaticalizations in Tibeto-Burman : evidence of Sapir's 'Drift'},
  journal   = {Linguistics of the Tibeto-Burman Area},
  volume    = {17},
  number    = {1},
  pages     = {61 -- 77},
  url       = {http://victoria.linguistlist.org/~lapolla//rjlapolla/papers/drift.pdf},
  year      = {2010},
}