Researching the Chinese Labour Corps during World War I is bound to force you outside narrow national boundaries.
Some of the best work on the Chinese in World War I has been done in France, with Li Ma’s book in the picture above being particularly good. It should also go without saying that Chinese authors and publishers, such as the Shandong Pictorial Publishing House, have produced really interesting books.
More challenging for Anglophones are some of the wonderful books published in the Netherlands, including the beautifully illustrated memoirs of Gu Xingqing, a translator with the Chinese Labour Corps.
There is also some interesting material online, with this website providing a good introduction.