APA (7th ed.) Citation

O, K., R, B., E, T., H, A., M, C., MA, O., . . . M, C. (2018). Purple urine bag syndrome, a disturbing urine discoloration. Urology case reports, 20, 57. https://doi.org/10.1016/j.eucr.2018.06.009

Chicago Style (17th ed.) Citation

O, Karray, et al. "Purple Urine Bag Syndrome, a Disturbing Urine Discoloration." Urology Case Reports 20 (2018): 57. https://doi.org/10.1016/j.eucr.2018.06.009.

MLA (9th ed.) Citation

O, Karray, et al. "Purple Urine Bag Syndrome, a Disturbing Urine Discoloration." Urology Case Reports, vol. 20, 2018, p. 57, https://doi.org/10.1016/j.eucr.2018.06.009.