Não informado. (1980). Family Relations. National Council on Family Relations.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Family Relations. Saint Paul, Minn: National Council on Family Relations, 1980.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Family Relations. National Council on Family Relations, 1980.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.