Yang, Yeung Ja
2007: A biographical study of the urban female elderly in later years and their life: centering on their devotion to grandchildren’s nurture. In: Journal of the Korean Gerontological Society 27, no. 1, p. 235-254

Yang, Yeung Ja
2006: A study of the structural changes of aging in Germany. In: Journal of welfare for the aged 34, p. 105-132