Janusz K. Zawodny, Death in the Forest: The Story of the Katyn Forest Massacre (London, 1971); Wladyslaw T. Bartoszewski, ‘Foreword’, in Salomon W. Slowes, The Road to Katyn: A Soldier’s Story (Oxford, 1992), vii-xxxii; and, most recently, Gerd Kaiser, Katyn: Das Staatsverbrechen — das Staatsgeheimnis (Berlin, 2002), and Anna M. Cienciala et al., Katyn: A Crime without Punishment (London, 2006).
