Campbell, J., Wathen, N. C., Merryweather, I., Abbott, R., Muller, D., & Chard, T. (1994). Concentrations of vitamins A and E in amniotic fluid, extraembryonic coelomic fluid, and maternal serum in the first trimester of pregnancy.

Campbell, J., N C. Wathen, I. Merryweather, R. Abbott, D. Muller, و T. Chard. Concentrations of Vitamins A and E in Amniotic Fluid, Extraembryonic Coelomic Fluid, and Maternal Serum in the First Trimester of Pregnancy. 1994.

Campbell, J., et al. Concentrations of Vitamins A and E in Amniotic Fluid, Extraembryonic Coelomic Fluid, and Maternal Serum in the First Trimester of Pregnancy. 1994.