Khushwant Singh's 'A History of the Sikhs' suffers from the same drawbacks that the mainstream secular-liberal scholarship does. The book seems to be serving his bias much more than the objective truth.
Author: Anshul Sharma (Anshul Sharma)
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Understanding Sikh Separatism
This essay gives a comprehensive overview of the evolution of Sikh separatism, and helps understand the underlying causes of the same.