Tolong jelaskan mengenai Rujukan dari Stephen Kalong Ningkan dalam bahasa melayu

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Roff, Margaret Clark. (1974) The Politics of Belonging: Political Change in Sabah and Sarawak. Kuala Lumpur, Malaysia: Oxford University Press.

Von Vorys, Karl. (1975) Democracy without Consensus: Communalism and Political Stability in Malaysia. Princeton, NJ: Princeton University Press.