Twins and cancer.

MLA

Siurala, M., et al. “Twins and Cancer.” British Medical Journal, vol. 3, no. 5825, Aug. 1972, pp. 530–31. EBSCOhost, https://doi.org/10.1136/bmj.3.5825.530-a.

APA

Siurala, M., Kekki, M., Varis, K., Isokoski, M., & Ihamäki, T. (1972). Twins and cancer. British Medical Journal, 3(5825), 530–531. https://doi.org/10.1136/bmj.3.5825.530-a

Chicago

Siurala, M., M. Kekki, K. Varis, M. Isokoski, and T. Ihamäki. 1972. “Twins and Cancer.” British Medical Journal 3 (5825): 530–31. doi:10.1136/bmj.3.5825.530-a.