Aspirants can utilize several authentic sources for government reports in their UPSC studies. Key resources include the Government of India official websites, such as the Ministry of Home Affairs, and Planning Commission. Publications like the Economic Survey and Annual Reports from various ministries are invaluable. They also can refer to resources from think tanks such as the NITI Aayog and RBI reports. Utilizing up-to-date digital libraries and archives ensures access to a wide range of government publications.