Nance, W. E., Kramer, A. A., Corey, L. A., Winter, P. M., & Eaves, L. J. (1983). A causal analysis of birth weight in the offspring of monozygotic twins.

Nance, W E., A A. Kramer, L A. Corey, P M. Winter, ja L J. Eaves. A Causal Analysis of Birth Weight in the Offspring of Monozygotic Twins. 1983.

Nance, W E., et al. A Causal Analysis of Birth Weight in the Offspring of Monozygotic Twins. 1983.