@misc{45760,
  title      = {Cálculo 4, 5, 7},
  url        = {http://www.sil.org/americas/peru/show_work.asp?id=20758},
  year       = {1972},
  country    = {Peru [PE]},
  lgcode     = {Candoshi-Shapra [cbu]},
  macro_area = {South America},
  sil_id     = {20758},
  src        = {sil16},
  subject    = {Arithmetic [Zarth]}
}