Surely you're familiar with all the standard databases and alike if you're at uni?
Google scholar, Researchgate, Wiley-Blackwell, Elsevier, etc, etc. There are a huge number of articles dealing with Asian elephant behavior and simply searching for the species name in any of the database give loads of results (usually scientific name is best, but in a species as well known as the elephants common name works, too). If you're just looking for a basic behavioral overview go to the biological section of your uni library and get volume 2 of Handbook of the Mammals of the World, or The Living Elephants: Evolutionary Ecology, Behaviour, and Conservation by Raman Sukumar. The Mammalian Species article for this Asian elephant is online too and it does provide some valuable information, but it is rather dated (1982).