Koestler, A. (1977). The Thirteenth tribe: The Khazar Empire and its heritage. Pan Books.
Citazione stile Chigago Style (17a edizione)Koestler, Arthur. The Thirteenth Tribe: The Khazar Empire and Its Heritage. London: Pan Books, 1977.
Citatione MLA (9a ed.)Koestler, Arthur. The Thirteenth Tribe: The Khazar Empire and Its Heritage. Pan Books, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.