Parenti's work is a good start. Definitely research about the institution of serfdom in Tibet and how the PRC abolished it. Just as importantly, point to CIA activities in Tibet and how the US was trying to use it as a pawn in the Cold War. Bring up the experience of Sitar, a former serf under the Dalai Lama's rule who is now a high-ranking member of the PRC government. Bring up how Tibetan families are exempt from the "One Child Rule". You also need to remind your audience that China is not a single-nation country, it's made up of dozens of nations that all have distinct cultures, identities and histories, and that the PRC is set up in a way to respect all of them.


My teacher likes me though so hopefully he won't cut me off or anything.
Socialist Party of Outer Space 
Not even isolated tribes on remote islands were as brutal as the ruling classes of Tibet.