P. I︠A︡. Chaadaev : zhiznʹ i myshlenie /
Gershenzon, M. O.(Mikhail Osipovich),1869-1925.
The Hague :  Mouton, 
1968.
Facsimile reprint of the St. Petersburg, 1908 edition.
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856.