Cita APA (7a ed.)

Büntgen, U., Wacker, L., Galván, J. D., Arnold, S., Arseneault, D., Baillie, M., . . . Young, G. H. F. (2018). Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE. Nature Portfolio.

Cita Chicago Style (17a ed.)

Büntgen, Ulf, et al. Tree Rings Reveal Globally Coherent Signature of Cosmogenic Radiocarbon Events in 774 and 993 CE. Nature Portfolio, 2018.

Cita MLA (8a ed.)

Büntgen, Ulf, et al. Tree Rings Reveal Globally Coherent Signature of Cosmogenic Radiocarbon Events in 774 and 993 CE. Nature Portfolio, 2018.