@book{rittih1870,
  address = {Kazan},
  author  = {Rittih, A. F.},
  key     = {Rittih (1870)},
  title   = {Materialy dlja etnografii Rossii. Kazanskaja gubernija (Materials for the Ethnography of Russia. Kazanskaja Guberia). Part. 2},
  year    = {1870}
}