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.
استشهاد بنمط شيكاغوNattrass, Stuart, et al. "Postreproductive Killer Whale Grandmothers Improve the Survival of Their Grandoffspring." Proc Natl Acad Sci U S A 2019.
MLA استشهادNattrass, Stuart, et al. "Postreproductive Killer Whale Grandmothers Improve the Survival of Their Grandoffspring." Proc Natl Acad Sci U S A 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.