@misc{87885,
  pages      = {83},
  title      = {Guía para los maestros: Naturaleza y vida social},
  url        = {http://www.sil.org/americas/peru/show_work.asp?id=20575},
  year       = {1956},
  country    = {Peru [PE]},
  inlg       = {Spanish [spa]},
  lgcode     = {Spanish [spa]},
  macro_area = {Eurasia},
  sil_id     = {20575},
  src        = {sil16},
  subject    = {Social studies [Zsst], Teacher's guides [Ztgd]}
}