Books by O. I. Pechnikov
Vyrăs shkulĕn 5-mĕsh klasĕnchi
Vyrăs shkulĕn 5-mĕsh klasĕnchi chăvash chĕlkhi urokĕsem
Vyrăs shkulĕn 8-mĕsh klasĕnchi
Vyrăs shkulĕn 8-mĕsh klasĕnchi chăvash chĕlkhi urokĕsem
Chăvash chĕlkhipe literaturin
Chăvash chĕlkhipe literaturin metodiki
Chăvashla kalaśma vĕrenetpĕr
Chăvashla kalaśma vĕrenetpĕr
Chăvash sămakhĕ
Chăvash sămakhĕ
Sochineni mĕnle śyrmalla
Sochineni mĕnle śyrmalla