Chekosurobakia e no gokakoku guntai no shinʼyū mondai to kagakuteki shakai shugi no gensoku no yōgo. - Nihon Kyōsantō. Chūō Iinkai (Tōkyō : Nihon Kyōsantō Chūō Iinkai Shuppankyoku, 1970)
Mode of access: Internet.
Keywords: Czechoslovakia -- History -- Intervention, 1968.