Saya mau tau E., Holuber: Dostoevsky's Grandson dari Arthur Koestler

Autobiographical Video-Interview with Arthur Koestler in French with German sub-titles and comments

2007 City Journal article on Koestler

General Properties of Koestler's Open hierarchical Systems

Koestler's Legacy – Fortean Times article on the centenary of Koestler's birth

Koestler Parapsychology Unit – Koestler and his third spouse left a large sum of money for research into parapsychology: this funded, among other things, the Koestler Parapsychology Unit at Edinburgh University

Mystical Experiences of Arthur Koestler