Pisʹma dekabrista Aleks︠i︡e︠i︡a Petrovicha ︠I︡Ushnevskago i ego zheny Marīi Kazimirovny iz Sibiri - ︠I︡Ushnevskīĭ, Aleks︠i︡eĭ Petrovich, 1786-1844 (Russian history and culture, 1908)