update LICENSE.md with proper source attributions

LICENSE.md

@@ -1,33 +1,44 @@
 # License Information
 
-This dataset combines data from multiple sources with different licenses:
+This dataset combines data from multiple sources with different licenses.
 
-## Creative Commons Attribution 4.0 (CC-BY-4.0)
-- **Glottolog 4.8** (Max Planck Institute for Evolutionary Anthropology)
-- Provides: ISO 639-3 codes, glottocodes, language family classification, coordinates, macroareas
-- Full license: https://creativecommons.org/licenses/by/4.0/
+## Integration Work (MIT)
 
-## Summary/Derived Data
-- **Ethnologue** (SIL International)
-- Coordinate and speaker data derived from publicly available summaries
-- Original database requires subscription
+The integration, curation, and merging of sources into `world_languages_integrated.json`
+is original work by Luke Steuber, released under the MIT License.
 
-## Public API Data
-- **Joshua Project**
-- Speaker population aggregates, Bible translation status, religion data
-- Available via public API: joshuaproject.net
+Copyright (c) 2026 Luke Steuber
+
+## Glottolog (CC-BY-4.0)
+
+Geographic coordinates, language family classification, glottocodes, and macroareas
+are from Glottolog (Max Planck Institute for Evolutionary Anthropology).
+
+Hammarstrom, Harald & Forkel, Robert & Haspelmath, Martin & Bank, Sebastian. 2024.
+Glottolog 5.0. https://glottolog.org
+
+Licensed under Creative Commons Attribution 4.0 International.
+https://creativecommons.org/licenses/by/4.0/
+
+## Joshua Project (Public API)
+
+Speaker population aggregates, Bible translation status, and religion data
+from the Joshua Project public API (https://joshuaproject.net).
 
 ## Combined Dataset
 
 This compiled dataset is released under **CC-BY-4.0** with requirements to:
 
-1. Credit Glottolog 4.8 for language classification data
-2. Note that Ethnologue coordinates are derived from summary data
-3. Credit Joshua Project for population and Bible translation data
+1. Credit Glottolog for language classification and geographic data
+2. Credit Joshua Project for population and demographic data
 
 ## Citation
 
-```
-Steuber, L. (2026). World Languages: 7K Languages Integrated [Dataset].
-Kaggle. https://www.kaggle.com/datasets/lucassteuber/world-languages
+```bibtex
+@dataset{world_languages_2026,
+  title = {World Languages: 7,130 Languages with Coordinates and Features},
+  author = {Steuber, Luke},
+  year = {2026},
+  url = {https://huggingface.co/datasets/lukeslp/world-languages}
+}
 ```