1. Formation of the bilaminar embryo: The second week, in The Developing Human: Clinically Oriented Embryology, (ed 2), (ed). WB Saunders, Philadelphia, PA, 1988.
2. Pregnancy I: Embryo, in Endovaginal Ultrasound, (ed). Alan R. Liss, New York, 1988.
3. Ultrasound demonstration of the normal fetal yolk sac
4. Detection of fetal cardiac activity between 41 and 43 days of gestation.