Craig, M. (1986). The Crystal Spirit: Lech Walesa and his Poland.
Chicago Style aipamenaCraig, Mary. The Crystal Spirit: Lech Walesa and His Poland. London, Hodder & Stoughton, 1986.
MLA aipamenaCraig, Mary. The Crystal Spirit: Lech Walesa and His Poland. 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.