Localización:Parliamentary history, ISSN-e 1750-0206, Vol. 29, Nº. 1 (February 2010), 2010 (Ejemplar dedicado a: Speakers and the speakership : presiding officers and the management of business from the middle ages to the 21st century / Paul Seaward (ed. lit.)), ISBN 9781444332896, págs. 1-7
