Albert Fredrick Pollard: Seymour, Edward. Smith and Elder, London, S. 299–310, Dictionary of National Biography. Eingspeist in: Seymour, Edward. In: Henry Colin Gray Matthew, Brian Harrison (Hrsg.): Oxford Dictionary of National Biography, from the earliest times to the year 2000 (ODNB). Band 7: Box–Browell. Oxford University Press, Oxford 2004, ISBN 0-19-861357-1 (doi:10.1093/ref:odnb/25159 Lizenz erforderlich), Stand: 2004