The Duchess who dared, 1995: t.p. (Margaret, Duchess of Argyll) p. vii, etc. (Margaret Whigham, Scots-born socialite and heiress; her second marriage was to the Duke of Argyll; b. Dec. 1 1912, d. July 26, 1993)
Wikipedia, viewed August 12, 2013 : (born Ethyl Margaret Whigham, Dec. 1, 1912; d. in London, July 25, 1993)
Biogr. ind., vol. 20 (Argyll, Margaret Campbell, Duchess of)