Credits:

1. https://harrypotter.fandom.com/wiki/Category:Founder_relics

2. https://www.harrypotter.com/features/stories-of-the-hogwarts-founders

3. https://www.harrypotter.com/features/stories-of-the-hogwarts-founders

4. https://foretoday.asia/articles/4-houses-with-work/

5. https://harrypotter.fandom.com/wiki/Hogwarts_School_of_Witchcraft_and_Wizardry

6. https://potterstoryweb.com/146/บ้านนักเรียน-ฮอกวอตส์/#google_vignette

7. https://www.muggle-v.com/7056/#google_vignette

8. https://screenrant.com/hogwarts-professor-houses-harry-potter/