↑ Owings, W.A. Dolph (1984). The Sarajevo Trial. Documentary Publications. p. 86. ISBN0-89712-122-8. Premuzic: Do you believe in God, or are you more an atheist? Princip: Atheist.
↑ Johnson, Lonnie (1989). Introducing Austria: A short history. pp. 52–54. ISBN0-929497-03-1.
↑ Gilbert, Martin (1995). First World War. HarperCollins. pp. 20–24. ISBN0-00-637666-5.
↑ The Sleepwalkers, How Europe went to war in 1914, Christopher Clark, p.49