I. Ivan, Some Problems of Formation and Functioning of the Mari Literary Language » Linguistica Uralica XXXIII, pp.41-50, 1997.

=. Karakulov-1987 and ?. ?. ?????????, « O ?????????? ???????????? ?????????? ?????????? ???????????? XIX ???? », ?????????? : ??????? ????????????? ? ??????? ???????? ??????, pp.103-107, 1987.

. Kel-'makov, ????????? ???????? ???????????, ?????? ??????? ??????????? ???????????, 2001.

=. Kirillova-1995, ?. E. ?????????, ». O?-?????????, and ?. K?????, ?????????-??????? ???????, 1995.

M. David and C. Michael, History of Russia and the Soviet Union, 1982.

=. Prokop-'ev-1905 and K. ?????????, « ???????? ???? ????? ????????? ?????????? ???? ??? ?????????? ?????????? I », ???????????? ??????????, pp.171-176, 1905.