APA (7th ed.) Citation

PR, H., RR, P., & DP, K. (1984). Effect of aging upon small intestinal structure in the Fischer rat. Journal of gerontology, 39(6), 642. https://doi.org/10.1093/geronj/39.6.642

Chicago Style (17th ed.) Citation

PR, Holt, Pascal RR, and Kotler DP. "Effect of Aging upon Small Intestinal Structure in the Fischer Rat." Journal of Gerontology 39, no. 6 (1984): 642. https://doi.org/10.1093/geronj/39.6.642.

MLA (9th ed.) Citation

PR, Holt, et al. "Effect of Aging upon Small Intestinal Structure in the Fischer Rat." Journal of Gerontology, vol. 39, no. 6, 1984, p. 642, https://doi.org/10.1093/geronj/39.6.642.