Collectivization at the Grass Roots Level : State Planning and Popular Reactions in Bulgaria, Romania, Poland, and the GDR, 1948-1960 - Witkowski, Gregory R. (. Collectivization of agriculture in communist Eastern Europe. - Budapest [u.a.] : Central European Univ. Press, 2014. - VII, 557 S.. - ISBN 978-615-5225-63-5, 2014)