APA (7th ed.) Citation

DA, P., C, K., & A, S. (2003). Healthcare economics for the emergency physician. The American journal of emergency medicine, 21(1), 55. https://doi.org/10.1053/ajem.2003.50024

Chicago Style (17th ed.) Citation

DA, Propp, Krubert C, and Sasson A. "Healthcare Economics for the Emergency Physician." The American Journal of Emergency Medicine 21, no. 1 (2003): 55. https://doi.org/10.1053/ajem.2003.50024.

MLA (9th ed.) Citation

DA, Propp, et al. "Healthcare Economics for the Emergency Physician." The American Journal of Emergency Medicine, vol. 21, no. 1, 2003, p. 55, https://doi.org/10.1053/ajem.2003.50024.