APA (7th ed.) Citation

A, K., L, L., & W, L. (2008). Critically appraising qualitative research. BMJ: British Medical Journal (International Edition), 337(7671), 687. https://doi.org/10.1136/bmj.a1035

Chicago Style (17th ed.) Citation

A, Kuper, Lingard L, and Levinson W. "Critically Appraising Qualitative Research." BMJ: British Medical Journal (International Edition) 337, no. 7671 (2008): 687. https://doi.org/10.1136/bmj.a1035.

MLA (9th ed.) Citation

A, Kuper, et al. "Critically Appraising Qualitative Research." BMJ: British Medical Journal (International Edition), vol. 337, no. 7671, 2008, p. 687, https://doi.org/10.1136/bmj.a1035.