Jeremy Lewis, David Astor: A Life in Print, London: Jonathan Cape, ISBN9780224090902, p. 123.
Stephen E. Koss, The Rise and Fall of the Political Press in Britain, Volume 2 The Twentieth Century, London: Hamish Hamilton, 1984, ISBN9780241105610, p. 612.
According to Katharine Garvin, J. L. Garvin: A Memoir, London: Heinemann, 1948, OCLC186300723, p. 60, of J. L. Garvin's second, third, and fourth children, two were born on 1 January and one on 2 January; she herself, the fourth, was born on 1 January (p. 44) and her older sister Una on 2 January (p. 41); therefore Viola, the second child, must be the other who was born on 1 January.