Nawoord: de Vrije Gedachte als zin van de geschiedenis P. B. Cliteur In: "Civis Mundi". Vol 41. Pp 105-110. 2002 2 substantive philosophy of history freedom/liberty meaning/sense (in/of history)
Natura, storia, libertà e la logica integrate Leo Gabriel In: "Giornale di Metafisica". Vol 22. Pp 625-642. 1967 2 substantive philosophy of history freedom/liberty meaning/sense (in/of history)