Não informado. (1980). Family Relations. National Council on Family Relations.
Chicago-Zitierstil (17. Ausg.)Não informado. Family Relations. Saint Paul, Minn: National Council on Family Relations, 1980.
MLA-Zitierstil (8. Ausg.)Não informado. Family Relations. National Council on Family Relations, 1980.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.