Não informado. (1980). Family Relations. National Council on Family Relations.
Chicago-referens (17:e uppl.)Não informado. Family Relations. Saint Paul, Minn: National Council on Family Relations, 1980.
MLA-referens (8:e uppl.)Não informado. Family Relations. National Council on Family Relations, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.