“CHALLENGE AND RESPONSE THEORY AND THE PHASES OF CIVILIZATIONAL EXPANSION AND COLLAPSE FROM THE ENGLISH PHILOSOPHER ARNOLD TOYNBEE’S VIEW” (2024) International Development Planning Review, 23(1), pp. 2567–2587. Available at: https://idpr.org.uk/index.php/idpr/article/view/337 (Accessed: 14 October 2026).