- [S208] Genes Reunited Website, (http://www.genesreunited.co.uk;), tree produced by Maurice Dibble, 2004 (Reliability: 2).
- [S111] Civil Registration Birth Indexes, General Register Office, (1837-;), birth registration of Albert R Lansdell, Harding, Islington 1b 389, June quarter 1921 (Reliability: 2).
- [S324] Lansdell family tree, Judith Lansdell, (March 1999;).
recorded as Les Ayres
- [S113] Civil Registration Marriage Indexes, General Register Office, (1837-;), marriages of Samuel B Lansdell and Ellen L Harding share reference Islington 1b 840, September quarter 1913 (Reliability: 3).