APA (7th ed.) Citation

BENEDICT, F. G., & Root, H. F. (1934). Potentialities of extreme old age. Proceedings of the National Academy of Sciences of the United States of America, 20, 389. https://doi.org/10.1073/pnas.20.6.389

Chicago Style (17th ed.) Citation

BENEDICT, Francis Gano, and H. F. Root. "Potentialities of Extreme Old Age." Proceedings of the National Academy of Sciences of the United States of America 20 (1934): 389. https://doi.org/10.1073/pnas.20.6.389.

MLA (9th ed.) Citation

BENEDICT, Francis Gano, and H. F. Root. "Potentialities of Extreme Old Age." Proceedings of the National Academy of Sciences of the United States of America, vol. 20, 1934, p. 389, https://doi.org/10.1073/pnas.20.6.389.