Update README.md

README.md

@@ -434,3 +434,11 @@ We are currently in the process of creating a pre-print to describe our methods,
 	publisher = { Hugging Face }
 }
 ```
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+If you use materials data which include (”mp-”) in the `immutable_id`, please cite the [Materials Project](https://pubs.aip.org/aip/apm/article/1/1/011002/119685/Commentary-The-Materials-Project-A-materials).
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+If you use materials data which include (”agm-”) in the `immutable_id`, please cite [Alexandria PBE](https://www.science.org/doi/10.1126/sciadv.abi7948) or [Alexandria PBESol, SCAN](https://www.nature.com/articles/s41597-022-01177-w).
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+If you use materials data which include (”oqmd-”) in the `immutable_id`, please cite [OQMD](https://link.springer.com/article/10.1007/s11837-013-0755-4).
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+Finally, if you make use of the Phase Diagram for visualization purposes, or the crystal viewer in the Materials Explorer, please acknowledge [Crystal Toolkit](https://github.com/materialsproject/crystaltoolkit).