Links
[1] https://civilresistance.info/biblio-item/1989/samizdat-and-independent-society-central-and-eastern-europe
[2] https://civilresistance.info/biblio-item/1976/czechoslovakias-interrupted-revolution
[3] https://civilresistance.info/section/c-popular-resistance-communist-regimes/c-i-soviet-bloc/c-i1-soviet-bloc-1950s-1970s-major-1