Viscount Robert Stewart Castlereagh

• Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry, Volume 10
• Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry
• Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry; Volume 11
• Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry; Volume 12