APA citiranje

Birks, H. J. B. (2020). Angiosperms versus gymnosperms in the Cretaceous. Proc Natl Acad Sci U S A.

Citação norma Chicago

Birks, H. John B. "Angiosperms Versus Gymnosperms in the Cretaceous." Proc Natl Acad Sci U S A 2020.

MLA citiranje

Birks, H. John B. "Angiosperms Versus Gymnosperms in the Cretaceous." Proc Natl Acad Sci U S A 2020.