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6. https://www.britannica.com/biography/William-Thomson-Baron-Kelvin.

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9. https://www.chemie.de/lexikon/Hennig_Brand.html.

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11. https://www.beautifulchemistry.net/cavendish.

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13. https://www.beautifulchemistry.net/lavoisier.

14. https://www.chemie.de/lexikon/Antoine_Laurent_de_Lavoisier.html.

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16. https://www.newscientist.com/question/what-is-the-body-made-of/.

17. https://www.mythoworld.com/sage-kanada-father-of-the-atomic-theory/.

18. Narayan, Roopa (2014 ): Space, Time and Anu in Vaisheshika, https://www.ece.lsu.edu/kak/roopa51 .pdf.

19. https://www.britannica.com/biography/Democritus.

20. https://www.britannica.com/biography/Abu-Musa-Jabir-ibn-Hayyan.