Superfecundation.

MLA

Woods, D. L., and A. F. Malan. “Superfecundation.” Archives of Disease in Childhood, vol. 55, no. 12, Dec. 1980, p. 974. EBSCOhost, https://doi.org/10.1136/adc.55.12.974.

APA

Woods, D. L., & Malan, A. F. (1980). Superfecundation. Archives of Disease in Childhood, 55(12), 974. https://doi.org/10.1136/adc.55.12.974

Chicago

Woods, D L, and A F Malan. 1980. “Superfecundation.” Archives of Disease in Childhood 55 (12): 974. doi:10.1136/adc.55.12.974.