to Crystal:
I think immigration Officers generally see Google Scholar as the most reliable source. Some of my Chinese colleagues have a special way to "find out" their citations count by using a specific tool that can "reflect" their citations record on Google Scholar. Maybe you can try to get this app?to Crystal:
CNKI and Web of Science shold be fine. Do you have your citation record on other databases that are not barred by Chinese government? Like Researchgate?