Sacha Zala: «Coloured Books. The Censorship of Diplomatic Documents», in: Censorship. A World Encyclopedia, hrsg. von Derek Jones, Fitzroy Dearborn: London/Chicago 2001, Bd. 1, S. 551–553.
Articoli enciclopedici2.9.2005
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Sacha Zala: «Coloured Books. The Censorship of Diplomatic Documents», in: Censorship. A World Encyclopedia, hrsg. von Derek Jones, Fitzroy Dearborn: London/Chicago 2001, Bd. 1, S. 551–553.