Mahjong

• https://osamuko.com/mahjong-teaching-method-tibet-rules/
• https://www.victoriamahjongclub.com/resources

HK Mahjong

• https://www.hkmahjong.org/rules
• https://gghk-assets.oss-cn-shanghai.aliyuncs.com/assets/pdf/GGHK-Classical-Hong-Kong-Mahjong-Rulebook-EN.pdf
• https://mcgillmahjong.blogspot.com/p/hong-kong-old-style-our-rules.html?m=1
• https://mahjongscoring.org/info/scoring
• https://tilebuddy.app/blog/hong-kong-mahjong-rules-for-beginners/