+ Karen Douglas et al. - The Psychology of Conspiracy Theories
+ Art Swift - Majority in U.S. Still Believe JFK Killed in a Conspiracy
+ Marta Marchlewska et al. - Addicted to answers: Need for cognitive closure and the endorsement of conspiracy beliefs
+ David Rietzes - JFK conspiracy theories at 50: how the skeptics got it wrong and why it matters
Main research method (source source?): Google Scholar