John Campbell, Duke of Argyll - Military career and honorary military appointments. - http://www.regiments.org/biography/royals/1845argl.htm
The Duke of Argyll - A biography of Lord Lorne, the fourth Governor General of Canada. - http://www.gg.ca/gg/fgg/bios/01/lorne_e.asp
John Douglas Sutherland Campbell - Portrait, brief biography, his words for the hymn "Unto the Hills Around Do I Lift Up." - http://www.cyberhymnal.org/bio/c/a/m/campbell_jds.htm