APA-ийн эшлэл(7 дахь хэвлэлт)

Ko, I., & Xing, J. (2009). Extra classes and subjective well-being: Empirical evidence from Vietnamese children. Young Lives.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Ko, I., ба J. Xing. Extra Classes and Subjective Well-being: Empirical Evidence from Vietnamese Children. Young Lives, 2009.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Ko, I., ба J. Xing. Extra Classes and Subjective Well-being: Empirical Evidence from Vietnamese Children. Young Lives, 2009.