411 REFERENCE · Wikibooks
Pinyin/Knowledge
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Pinyin#Pinyin tone marking
Knowledge is all the facts that someone knows about a particular subject.
zhishir shih moourern rehnshir guanyur tehdihng zhuutir d suooyoou shihshir.