Tarasov, B.N. V mire cheloveka, 1986 p. 264 (P.I︠A︡. Chaadaev; Petr I︠A︡kovlevich Chaadaev)
LC data base, 12-1-86 (hdg.: Chaadaev, Petr I︠A︡kovlevich, 1794-1856; usage: Pëtr Jakovlevič Čaadàev; Peter Chaadaev, Peter Chaadayev) LC manual cat. (usage: Pierre Tchaadaev, Peter Jakovlevič Čaadaev; Pietro Čaadaev; Peter J. Tschaadajews)
His Filosoficheskie pisʹma, 1987 t.p. (Petr Chaadaev)
Köves, E. Az orosz dilemma, c1987 t.p. (Csaadajev) p. 5 (Pjotr Jakovlevics Csaadajevről)