Looking back.

MLA

Sheehy, S. B. “Looking Back.” Journal of Emergency Nursing, vol. 25, no. 6, Dec. 1999, pp. 439–40. EBSCOhost, https://doi.org/10.1016/s0099-1767(99)70002-4.

APA

Sheehy, S. B. (1999). Looking back. Journal of Emergency Nursing, 25(6), 439–440. https://doi.org/10.1016/s0099-1767(99)70002-4

Chicago

Sheehy, S B. 1999. “Looking Back.” Journal of Emergency Nursing 25 (6): 439–40. doi:10.1016/s0099-1767(99)70002-4.