1. Pethidine in Labour
2. RELIEF OF PAIN IN LABOUR
3. J. S. Crawford (1972 ): Principles and Practice of Obstetric Anaesthesia , 3rd edition . Blackwell Scientific Publications, Oxford, p.102 .
4. J. S. Crawford (1972 ): Principles and Practice of Obstetric Anaesthesia , 3rd edition . Blackwell Scientific Publications, Oxford, p.134 .