Perkins, S. (2017). Inner Workings: How saving some of the Southeast’s oldest trees might help scientists monitor climate change. Proc Natl Acad Sci U S A.
استشهاد بنمط شيكاغوPerkins, Sid. "Inner Workings: How Saving Some of the Southeast’s Oldest Trees Might Help Scientists Monitor Climate Change." Proc Natl Acad Sci U S A 2017.
MLA استشهادPerkins, Sid. "Inner Workings: How Saving Some of the Southeast’s Oldest Trees Might Help Scientists Monitor Climate Change." Proc Natl Acad Sci U S A 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.