HARTLEY , R. G. . . IRUTION AND DENSITY OF POPULATION 1954.66. . مجلة كلية الاداب, [S. l.], n. 3, 1969. DOI: 10.37376/jofoa.vi3.2816. Disponível em: https://journals.uob.edu.ly/JOFOA/article/view/2816. Acesso em: 29 2025.