Sherry L. WILLIS (ed), Mike MARTIN (ed), Middle Adulthood: A Lifespan Perspective, Thousand Oaks, Sage, 2005, 35-61
KOHLI, Martin, KÜNEMUND, Harald, The Middle Generation in the Family: Patterns of Exchange and Support, in Sherry L. WILLIS (ed), Mike MARTIN (ed), Middle Adulthood: A Lifespan Perspective, Thousand Oaks, Sage, 2005, 35-61
- https://hdl.handle.net/1814/3315