I have learn the very old way of 检索 (光盘的和纸质的) many years ago, but I rarely use the method now. Compared to the U.S.A. and European countries, it is hard to find usfule literature and information in China because good online database usually need to subscribe and we don't have the money to pay the subscription fee. Most U.S. universities have many journals and books, earlier and current issues, in the forms of both electronic and hard copy. Usually, I use MEDILINE, EBM reviews, CINAHL, Psychoinfo, Web of Science, etc. to search articles because my school has paid for these services. In addition, scholar.google.com is a good choice if you don't have the right to access those online database.