The following links to Government sources offer a wealth of information on relations with China
Australian Parliament Search Hansard for debates, speeches from various Parliaments dating back to 1901. Use parliament no. to perform your search
United Kingdom. Parliament Search Hansard for debates, speeches from House of Commons and House of Lords of Parliaments dating back to 1803
United States Congressional Documents Search Congressional documents dating from 1789
The Government Documents section on the third floor of the Ballieu Library contains items of interest.
The Irish University Press area studies series. British parliamentary papers on China contain correspondence on a number of issues of importance for 19th century British and Chinese relations.