Różycka-Tran, J., Jurek, P., Olech, M., Piotrowski, J., & Żemojtel-Piotrowska, M. (2019). A Warrior Society: Data From 30 Countries Show That Belief in a Zero-Sum Game Is Related to Military Expenditure and Low Civil Liberties. Front Psychol.

Różycka-Tran, Joanna, Paweł Jurek, Michał Olech, Jarosław Piotrowski, và Magdalena Żemojtel-Piotrowska. "A Warrior Society: Data From 30 Countries Show That Belief in a Zero-Sum Game Is Related to Military Expenditure and Low Civil Liberties." Front Psychol 2019.

Różycka-Tran, Joanna, et al. "A Warrior Society: Data From 30 Countries Show That Belief in a Zero-Sum Game Is Related to Military Expenditure and Low Civil Liberties." Front Psychol 2019.