APA ציטוט

Stone, M. J., Levy, S. F., Tait, W., Allan, P. J., & Riley, P. J. (1991). Prenatal screening for Down's syndrome.

Citação norma Chicago

Stone, M J., S F. Levy, W. Tait, P J. Allan, and P J. Riley. Prenatal Screening for Down's Syndrome. 1991.

ציטוט MLA

Stone, M J., et al. Prenatal Screening for Down's Syndrome. 1991.