Princeton University Press: Lorenz M. Lüthi's "The Sino-Soviet Split: Cold War in the Communist World"

Read this essay. What is the main argument proposed here regarding the breakdown of Soviet and Chinese in 1966? What historical sources does the author analyze to support his argument?

Click http://web.archive.org/web/20120223151523/https://press.princeton.edu/chapters/i8688.html link to open resource.