Queen Elizabeth: the Queen Mother: the official biography. 2009.

Elizabeth Angela Marguerite Bowes Lyon, the youngest daughter of of the Earl of Strathmore was born on 4 August 1900. Drawing on her personal letters and other unpublished materials from the Royal Archives, Queen Elizabeth the Queen Mother reveals the witty girl who endeared herself to soldiers convalescing at Glamis in the First World War; the assured young Duchess of York; the Queen, at last feeling able to look the East End in the face at the height of the Blitz; thenQueen Mother, representing the nation at home and abroad throughout her long widowhood.