杜会琴. (2011). 20几岁懂了就不晚: You are not too late to know this. 龙门书局.
Chicago Style aipamena杜会琴. 20几岁懂了就不晚: You Are Not Too Late to Know This. 龙门书局, 2011.
MLA aipamena杜会琴. 20几岁懂了就不晚: You Are Not Too Late to Know This. 龙门书局, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.