Junkins, E. J., J. E. Potter, P. J. Rentfrow, S. D. Gosling, J. Potter, K. P. Harden, E. M. Tucker-Drob, J. Derringer, and D. A. Briley. “Geographic Variation in Personality Is Associated With Fertility Across the United States”. Personality Science, Vol. 2, Dec. 2021, pp. 1-26, doi:10.5964/ps.7275.