2025-12-122025-12-122024https://drive.google.com/file/d/1SfR43sRtGYrAhI48iHyvMHws_nJcqwDr/view?usp=sharinghttp://ssm.ndl.gov.in/handle/123456789/1786(ঐতিহাসিক ভাষাবিজ্ঞান)