https://www.enciklopedija.hr/clanak/demokrit 

https://enciklopedija.hr/clanak/36216

https://edutorij-admin-api.carnet.hr/storage/extracted/f8d552c1-03ca-47a1-943a-61ea3e2d1bd0/povijest-modela-atoma.html#block-188432

https://www.enciklopedija.hr/clanak/epikur

https://hr.izzi.digital/DOS/56948/56984.html 

https://edutorij-admin-api.carnet.hr/storage/extracted/eb63acab-6d0c-4a0a-84b8-345fddcdcec2/modeli-atoma-povijesni-razvoj.html