- [S111] Civil Registration Birth Indexes, General Register Office, (1837-;), birth registration of Leonard A Lansdell, Willis, Islington 1b 343, December quarter 1913 (Reliability: 3).
- [S112] Civil Registration Death Indexes 1837-, General Register Office, death registration of Leonard A Lansdell, 0, Islington 1b 338, March quarter 1914 (Reliability: 2).
- [S324] Lansdell family tree, Judith Lansdell, (March 1999;).
recorded as Les Ayres
- [S205] FreeBMD, (www.freebmd.org.uk;), marriages of Joseph V Lansdell and Martha E Willis share reference Islington 1b 546, June quarter 1911 (Reliability: 2).