APA (7th ed.) Citation

RE, H., BC, S., & JS, W. (2004). The puzzling popularity of the PPO. Health affairs (Project Hope), 23(2), 56. https://doi.org/10.1377/hlthaff.23.2.56

Chicago Style (17th ed.) Citation

RE, Hurley, Strunk BC, and White JS. "The Puzzling Popularity of the PPO." Health Affairs (Project Hope) 23, no. 2 (2004): 56. https://doi.org/10.1377/hlthaff.23.2.56.

MLA (9th ed.) Citation

RE, Hurley, et al. "The Puzzling Popularity of the PPO." Health Affairs (Project Hope), vol. 23, no. 2, 2004, p. 56, https://doi.org/10.1377/hlthaff.23.2.56.