1. Extraembryonic membranes and placentation;Latshaw,1987
2. Types of eutharian placentation;Mossman,1987
3. The mammalian fetal membranes;Perry;J Reprod Fert,1981
4. Blood vascular system;Latshaw,1987
5. The mammalian yolk sac placenta;Freyer;J Exp Zoolog (Mol Dev Evol),2008