APA (7th ed.) Citation

Massen, J. J. M., Hartlieb, M., Martin, J. S., Leitgeb, E. B., Hockl, J., Kocourek, M., . . . Gallup, A. C. (2021). Brain size and neuron numbers drive differences in yawn duration across mammals and birds. Nature Portfolio.

Chicago Style (17th ed.) Citation

Massen, Jorg J. M., et al. Brain Size and Neuron Numbers Drive Differences in Yawn Duration Across Mammals and Birds. Nature Portfolio, 2021.

MLA (8th ed.) Citation

Massen, Jorg J. M., et al. Brain Size and Neuron Numbers Drive Differences in Yawn Duration Across Mammals and Birds. Nature Portfolio, 2021.

Warning: These citations may not always be 100% accurate.