The following sources were consulted in the preparation of the article “10 people who were killed for knowing too much.”
- The Litvinenko inquiry: report into the death of Alexander Litvinenko
- Wealthy businessman goes on trial over murder of Maltese journalist
- Thousands rally in Slovakia to mark the 2018 slayings of an investigative journalist and his fiancee
- What happened to the killers of Veronica Guerin?
- Mexican cartel scion, wanted in journalist’s death, sentenced to 5 years
- Case of Gongadze v. Ukraine
- Police in Sri Lanka arrest intelligence officers over journalist killing
- Five convicted of killing Russian journalist Politkovskaya
- Seven years after Mexican reporter’s still unpunished murder, presidential candidates asked to commit to combatting impunity
- The Arizona Project
