- [S325] Lansdell, Abbott & Nelson Genealogical Data, K.L. Watson, (1988;), Lansdell Genealogical Tree: The Families of Kent, Sussex and South London, including reference to emigrants to Canada and the USA, data compiled 1958-1970 (Reliability: 2).
- [S112] Civil Registration Death Indexes 1837-, General Register Office, death of Henry I. Hewetson, 24, Wandsworth 1d 247, June quarter 1911 (Reliability: 3).
- [S205] FreeBMD, (www.freebmd.org.uk;), birth registration of Henry Isaac Hewetson, Wandsworth 1d 659, March quarter 1887 (Reliability: 3).
- [S205] FreeBMD, (www.freebmd.org.uk;), marriages of Henry Isaac Hewetson and Emily Lansdell share reference St. Saviour, 1d 122, December quarter 1883 (Reliability: 3).