Wald, N. J., Cuckle, H. S., Densem, J. W., Nanchahal, K., Royston, P., Chard, T., . . . Canick, J. A. (1989). Serum screening for Down's syndrome: Authors' reply.
Čikaški stil citiranjaWald, Nicholas J., et al. Serum Screening for Down's Syndrome: Authors' Reply. 1989.
MLA način citiranjaWald, Nicholas J., et al. Serum Screening for Down's Syndrome: Authors' Reply. 1989.
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