Cholera.

MLA

Sack DA, et al. “Cholera.” Lancet, vol. 363, no. 9404, Jan. 2004, pp. 223–33. EBSCOhost, https://doi.org/10.1016/s0140-6736(03)15328-7.

APA

Sack DA, Sack RB, Nair GB, Siddique AK, Sack, D. A., Sack, R. B., Nair, G. B., & Siddique, A. K. (2004). Cholera. Lancet, 363(9404), 223–233. https://doi.org/10.1016/s0140-6736(03)15328-7

Chicago

Sack DA, Sack RB, Nair GB, Siddique AK, David A Sack, R Bradley Sack, G Balakrish Nair, and A K Siddique. 2004. “Cholera.” Lancet 363 (9404): 223–33. doi:10.1016/s0140-6736(03)15328-7.