Citing a four-volume series, which I don't have on my shelf, doesn't count as providing a source. This is not a current news article, it is a collection of essays.

Furthermore because the author is Xi Jinping, this is a first-party source which makes it biased by default - it is inherently self-interested, it cannot be otherwise. This would only be a valid counter if I had posted a link to a publication produced by the government of Taiwan itself, written by its president.

Reuters, AP News, the Guardian, and Al Jazeera (among the sources I linked) are all far more reliable and more importantly independent third-party sources.