Not all sources are created alike. For a clear explanation of how to assess the value of your sources, check out Berkley Library's guide.
When you encounter any kind of source, consider:
Records on all subjects (especially humanities and social sciences) pertaining to East, Southeast, and South Asia published worldwide in Western languages. Includes chapters in edited volumes, conference proceedings, etc. 1971+
Print back to 1946 at Firestone Reference (DR) & East Asian Library: (GEST) Z3001 .B49. Prior title covering 1936-40 at Gest Z3001.xB8; Cumulative bibliographies covering 1941-65 at GEST Z3001.C94 & Z3001.C93.