Gazetteer for Scotland: John Douglas Sutherland Campbell (9th Duke of Argyll): Brief biographical profile.
John Campbell, Duke of Argyll: Military career and honorary military appointments.
John Douglas Sutherland Campbell: Portrait, brief biography, his words for the hymn "Unto the Hills Around Do I Lift Up."
National Portrait Gallery: John Douglas Sutherland Campbell, 9th Duke of Argyll: List and descriptions of portraits held.
Sir John George Edward Henry Douglas Sutherland Campbell: Biography of the Marquis of Lorne.
The Duke of Argyll: A biography of Lord Lorne, the fourth Governor General of Canada.