威廉斯 & 索霏. (2016). 快来说“请”吧！: Time to say please! 北京联合出版公司.
Chicago Style (17th ed.) Citation威廉斯 and 索霏. 快来说“请”吧！: Time to Say Please! 北京联合出版公司, 2016.
MLA (8th ed.) Citation威廉斯 and 索霏. 快来说“请”吧！: Time to Say Please! 北京联合出版公司, 2016.
Warning: These citations may not always be 100% accurate.