APA (7th ed.) Citation

Oh, H., Rizo, C., Enkin, M., & Jadad, A. (2005). What Is eHealth (3): A Systematic Review of Published Definitions. JMIR Publications.

Chicago Style (17th ed.) Citation

Oh, Hans, Carlos Rizo, Murray Enkin, and Alejandro Jadad. What Is EHealth (3): A Systematic Review of Published Definitions. JMIR Publications, 2005.

MLA (9th ed.) Citation

Oh, Hans, et al. What Is EHealth (3): A Systematic Review of Published Definitions. JMIR Publications, 2005.