Nattrass, S., Croft, D. P., Ellis, S., Cant, M. A., Weiss, M. N., Wright, B. M., . . . Franks, D. W. (2019). Postreproductive killer whale grandmothers improve the survival of their grandoffspring. Proc Natl Acad Sci U S A.
Citação norma ChicagoNattrass, Stuart, et al. "Postreproductive Killer Whale Grandmothers Improve the Survival of Their Grandoffspring." Proc Natl Acad Sci U S A 2019.
MLA引文Nattrass, Stuart, et al. "Postreproductive Killer Whale Grandmothers Improve the Survival of Their Grandoffspring." Proc Natl Acad Sci U S A 2019.
警告：這些引文格式不一定是100％准確.