APA (7th ed.) Citation

Morgan, I. G., French, A. N., & Rose, K. A. (2018). Intense schooling linked to myopia. BMJ (Online), 361, k2248. https://doi.org/10.1136/bmj.k2248

Chicago Style (17th ed.) Citation

Morgan, Ian G., Amanda N. French, and Kathryn A. Rose. "Intense Schooling Linked to Myopia." BMJ (Online) 361 (2018): k2248. https://doi.org/10.1136/bmj.k2248.

MLA (9th ed.) Citation

Morgan, Ian G., et al. "Intense Schooling Linked to Myopia." BMJ (Online), vol. 361, 2018, p. k2248, https://doi.org/10.1136/bmj.k2248.