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 (17e ed.) Bronvermelding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 (8e ed.) Bronvermelding杜会琴. 20几岁懂了就不晚: You Are Not Too Late to Know This. 龙门书局, 2011.
Let op: Deze citaties zijn niet altijd 100% accuraat.