Speech at the 5th Congress of the Polish United Workers Party (12 November 1968), quoted in "The Rise and Fall of the Brezhnev Doctrine in Soviet Foreign Policy" by Matthew J. Ouimet, 2003.
Statement made in World War II, as a commissar on the southern front, as quoted in "Leonid I. Brezhnev: Pages from his Life" by Academy of Sciences of the USSR, p. 49, 1978.