闫瑞娟. (2011). 每天一堂业绩课: Daily achievement class. 新世界出版社.
Chicago Style (17th ed.) Citation闫瑞娟. 每天一堂业绩课: Daily Achievement Class. 新世界出版社, 2011.
MLA (8th ed.) Citation闫瑞娟. 每天一堂业绩课: Daily Achievement Class. 新世界出版社, 2011.
Warning: These citations may not always be 100% accurate.