APA citiranje

Levin, A. A., Schoenbaum, S. C., Stubblefield, P. G., Zimicki, S., Monson, R. R., & Ryan, K. J. (1982). Ectopic pregnancy and prior induced abortion.

Citação norma Chicago

Levin, A A., S C. Schoenbaum, P G. Stubblefield, S. Zimicki, R R. Monson, and K J. Ryan. Ectopic Pregnancy and Prior Induced Abortion. 1982.

MLA citiranje

Levin, A A., et al. Ectopic Pregnancy and Prior Induced Abortion. 1982.