APA
Chasen S. T., Spiro S. J., Kalish R. B. & Chervenak F. A. (20050830). Changes in fetal presentation in twin pregnancies. : The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.
Chicago
Chasen Stephen T, Spiro Stacey J, Kalish Robin B and Chervenak Frank A. 20050830. Changes in fetal presentation in twin pregnancies. : The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.
Harvard
Chasen S. T., Spiro S. J., Kalish R. B. and Chervenak F. A. (20050830). Changes in fetal presentation in twin pregnancies. : The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.
MLA
Chasen Stephen T, Spiro Stacey J, Kalish Robin B and Chervenak Frank A. Changes in fetal presentation in twin pregnancies. : The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians. 20050830.