Brown and Levinson nd

Brown, Penelope & Stephen C Levinson. n.d. Working dictionary of Tenejapan Tzeltal. (incorporating an earlier field dictionary O. Brent Berlin, Terrence Kaufman, and Luisa Maffi (1990)).

@unpublished{tseltal-R035,
  author = {Brown, Penelope and Levinson, Stephen C},
  note   = {incorporating an earlier field dictionary O. Brent Berlin, Terrence Kaufman, and Luisa Maffi (1990)},
  title  = {Working dictionary of Tenejapan Tzeltal}
}