Columbia subject headings:
Marriage law--English-speaking countries.
Marriage law--Great Britain.
Marriage law--United States.
Harvard subject headings:
Marriage law--English-speaking countries.
Marriage law--Great Britain.
Marriage law--United States.
Princeton subject headings:
Marriage law--Great Britain.
Marriage law--United States.
Marriage--Great Britain--History.
Marriage--Religious aspects--Christianity.
Marriage--United States--History.
Same-sex marriage--Law and legislation--Great Britain.
Same-sex marriage--Law and legislation--United States.
Same-sex marriage--Religious aspects--Christianity.