@book{efremova1982,
  address = {Riga},
  author  = {Efremova, L. S.},
  key     = {Efremova (1982)},
  title   = {Latyshskajak rest'janskajase m'jav Latgale, 1860-1939 (Latvian Rural Family in Latgal)},
  year    = {1982}
}