There are many interesting, freely available resources having to do with Asian American literature.
In particular, there are a lot of primary source materials that are well worth looking into.
This is a list of links to some of relevant materials on the internet.
Since many of the authors you are studying are contemporary, it's also a good idea to check the internet for interviews with them.
Authors often compile their interviews on their official sites, for instance:
For authors without official websites, Wikipedia often does a good job compiling lists of their interviews.
Newspaper sites may also feature interviews; I'd recommend using a news search such as Google News.
Finally, YouTube is often an excellent place to look for interviews. Video content allows you access to authors voices and body language as well as their words!