The European Laboratory on Marriage and Registered Partnership The Vermont Guide to Civil Unions, Vermont Secretary of State Civil Union Fact Sheet, Australian Capital Territory web site Same-Sex Marriage, Civil Unions, and Domestic Partnerships topic page from The New York Times
Truy cập 3 tháng 1 năm 2015.  The European Laboratory on Marriage and Registered Partnership The Vermont Guide to Civil Unions, Vermont Secretary of State Civil Union Fact Sheet, Lãnh thổ Thủ đô Úc web site Same-Sex Marriage, Civil Unions, and Domestic Partnerships topic page from The New York Times