APA (7th ed.) Citation

Levine, R. J. (1999). The Need to Revise the Declaration of Helsinki. The New England journal of medicine, 341(7), 531-534. https://doi.org/10.1056/NEJM199908123410713

Chicago Style (17th ed.) Citation

Levine, Robert J. "The Need to Revise the Declaration of Helsinki." The New England Journal of Medicine 341, no. 7 (1999): 531-534. https://doi.org/10.1056/NEJM199908123410713.

MLA (9th ed.) Citation

Levine, Robert J. "The Need to Revise the Declaration of Helsinki." The New England Journal of Medicine, vol. 341, no. 7, 1999, pp. 531-534, https://doi.org/10.1056/NEJM199908123410713.