English: This ㄩ-bw.png image is depicting the stroke order of the character ㄩ in bw.png style. This image is part of the “CJK Stroke Order Project” (en, de, ja, zh), a project on Wikimedia Commons to create a complete set of images depicting the right stroke order (protocols). The 214 Kangxi radicals have been completed by hand. The next goal is to complete the missing animations from the page GIF progress, help is welcome (official guidelines).
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China (PRC): 现代汉语通用字笔顺规范, 453pages, 1997, editeur: 语文出版社, ISBN:7801262018 (Authoritative, available online)
Japan : 筆順指導の手びき (Hitsujun shidō no tebiki), 1958. Note: Since 1977, the Japanese Ministry of Education recommend to publishers to simply « follow commonsensical [strokes] orders which are widely accepted in the society ».