MacKenzie, Kirsteen (২০০৯)। "OliverCromwell and the Solemn League and Covenant of the Three Kingdoms"। OliverCromwell: New Perspectives। Palgrave Macmillan।
Georg Feuerstein the Rig-Vedic rishis believed in reincarnation and karma. Cromwell: "Alongside Brahmanism was the non-Aryan shramanic culture with its roots