Liukkonen, Petri. "Robert Ludlum". Books and Writers (kirjasto.sci.fi). Finland: Kuusankoski Public Library. Archived from the original on March 31, 2007.
Liukkonen, Petri. "Robert Ludlum". Books and Writers (kirjasto.sci.fi). Finland: Kuusankoski Public Library. Archived from the original on March 31, 2007.