Warsaw, Trio. 1995: 547–567. ISBN 83-85660-62-3. See for instance: (波兰文) Barbara Polak. Zbrodnia katyńska (PDF). Biuletyn IPN. 2005: 4–21 [2007-09-22].
24sata.hr Napustio nas je zlatni hrvatski vaterpolist Miroslav Poljak (页面存档备份,存于互联网档案馆) (克羅埃西亞文) Former Lt. Gov., State Sen. Barbara Snelling dies. [2015-11-04]