Liu, Haiyan, and Zhiyong Zhang. “Birds of a Feather Flock Together and Opposites Attract: The Nonlinear Relationship Between Personality and Friendship”. Journal of Behavioral Data Science 1, no. 1 (May 30, 2021): 34–52. Accessed August 10, 2022. https://jbds.isdsa.org/index.php/jbds/article/view/10.