Citação norma APA

Iles, R. K., Purkis, P. E., Whitehead, P. C., Oliver, R. T., Leigh, I., & Chard, T. (1990). Expression of beta human chorionic gonadotrophin by non-trophoblastic non-endocrine 'normal' and malignant epithelial cells. Nature Publishing Group.

Citação norma Chicago

Iles, R. K., P. E. Purkis, P. C. Whitehead, R. T. Oliver, I. Leigh, and T. Chard. Expression of Beta Human Chorionic Gonadotrophin By Non-trophoblastic Non-endocrine 'normal' and Malignant Epithelial Cells. Nature Publishing Group, 1990.

Citação norma MLA

Iles, R. K., et al. Expression of Beta Human Chorionic Gonadotrophin By Non-trophoblastic Non-endocrine 'normal' and Malignant Epithelial Cells. Nature Publishing Group, 1990.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.