1. New Active Birth;Balaskas,1991
2. Diary methods: capturing life as it is lived;Bolger;Annual Review of Psychology,2003
3. Undisturbed birth—nature's hormonal blueprint for safety, ease and ecstasy;Buckley;Midirs Midwifery Digest,2004
4. Physiology of the uterine contraction;Caldeyro-Barcia;Clinical Obstetrics and Gynecology,1960
5. Dick-Read, G., 1968. Childbirth without fear, 5th edn. (re-edited). In: Snaith, L., Coxon, A. (Eds.), Heinemann, Chichester.