That's still an ad-homimen fallacy.
Check the factual veracity of the sources. The references to Muslim documents, with quotes, are given. These people are not talking out of their arse. In fact, they are letting the Muslim historians speak for themselves, in the second book. No bias there.
Check the factual veracity of the sources. The references to Muslim documents, with quotes, are given. These people are not talking out of their arse. In fact, they are letting the Muslim historians speak for themselves, in the second book. No bias there.
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