Khan, Roxanne, Gayle Brewer, and John Archer. “Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences”. Europe’s Journal of Psychology 16, no. 1 (March 3, 2020): 167-185. Accessed May 6, 2024. https://ejop.psychopen.eu/index.php/ejop/article/view/1620.