Columbia subject headings:
Concubinage--Scandinavia--History--Sources.
Marriage customs and rites, Medieval--Scandinavia--Sources.
Marriage--Scandinavia--History--Sources.
Harvard subject headings:
Concubinage--Scandinavia--History--Sources.
Marriage customs and rites, Medieval--Scandinavia--Sources.
Marriage--Scandinavia--History--Sources.
Princeton subject headings:
Concubinage--Iceland--History.
Concubinage--Scandinavia--History.
Marriage--Iceland--History.
Marriage--Scandinavia--History.
Women--Iceland--Social conditions.
Women--Scandinavia--Social conditions.