SumithRuwan
https://myschool.lk/%E0%B6%BD%E0%B7%92%E0%B6%B4%E0%B7%92/%E0%B6%B1%E0%B7%92%E0%B6%BB%E0%B7%8A%E0%B6%B8%E0%B7%8F%E0%B6%AB%E0%B7%8F%E0%B6%AD%E0%B7%8A%E0%B6%B8%E0%B6%9A-%E0%B7%83%E0%B6%B1%E0%B7%8A%E0%B6%B1%E0%B7%92%E0%B7%80%E0%B7%9A%E0%B6%AF%E0%B6%B1%E0%B6%BA
http://www.edudept.np.gov.lk/learning_materials/Passpapers/AL_Media_S.pdf
https://www.e-thaksalawa.moe.gov.lk/moodle/course/view.php?id=798
https://moratumahavidyalaya.files.wordpress.com/2020/06/unit-07-note-complete.pdf