1. The epidemiological approach in Obstetrics;Baird;Gynaecologia,1954
2. Elderly primigravidae;Booth;J Obstet Gynaecol Br Commonw,1964
3. A consideration of the treatment of elderly primigravidae;MacDonald;J Obstet Gynaecol Br Commonw,1960
4. Beazley JM. Special circumstances affecting labour CR Whitfield Dewhurst's Textbook of Obstetrics and Gynaecology for Postgraduates Blackwell Scientific Publications 25 358 359