APA (7th ed.) Citation

RD, M., B, S., & TI, W. (1993). Pertussis: The return of a bad penny. Pediatric emergency care, 9(4), 218.

Chicago Style (17th ed.) Citation

RD, Mathis, Shoaf B, and Weiner TI. "Pertussis: The Return of a Bad Penny." Pediatric Emergency Care 9, no. 4 (1993): 218.

MLA (9th ed.) Citation

RD, Mathis, et al. "Pertussis: The Return of a Bad Penny." Pediatric Emergency Care, vol. 9, no. 4, 1993, p. 218.