1. Natural childbirth;Read,1933
2. Revelation of childbirth. The principles and practice of natural childbirth;Read,1948
3. Psychoprofilaktyka bolei w rodach;Velvovski,1954
4. Systema psychoprofilakty-czeskowo obezboliwanija rodow;Velvovski,1963
5. A study of psychophysical methods for relief of childbirth pain;Buxton,1962