1. You and your baby: prenatal care, labor and delivery, and postpartum care. ACOG Patient Education Pamphlet AB005.,1999
2. Preterm labor. ACOG Patient Education Pamphlet AP004.,1999
3. How to tell when labor begins. ACOG Patient Education Pamphlet AP004.,1999
4. Williams obstetrics. 22nd ed.,2005
5. Obstetrics: normal and problem pregnancies. 4th ed.,2002