Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Ruby character:

"

Chinese characters and its derivations of it (chữ Hán and chữ Nôm) which was used by the Vietnamese have fallen out of use in favour of Latin-based script chữ Quốc ngữ during the French colonial period when it was made a part of compulsory education (1920s onwards). Currently still used by Gin people.[citation needed]