APA (7th ed.) Citation

Pellis, S. M., Pellis, V. C., Pelletier, A., & Leca, J. (2019). Is play a behavior system, and, if so, what kind? Behavioural processes, 160, 1-9. https://doi.org/10.1016/j.beproc.2018.12.011

Chicago Style (17th ed.) Citation

Pellis, Sergio M., Vivien C. Pellis, Amanda Pelletier, and Jean-Baptiste Leca. "Is Play a Behavior System, and, If so, What Kind?" Behavioural Processes 160 (2019): 1-9. https://doi.org/10.1016/j.beproc.2018.12.011.

MLA (9th ed.) Citation

Pellis, Sergio M., et al. "Is Play a Behavior System, and, If so, What Kind?" Behavioural Processes, vol. 160, 2019, pp. 1-9, https://doi.org/10.1016/j.beproc.2018.12.011.