Diffalah, Khaouni. “Principle of a Common Climate or Theory of Collective Goods (collective Action on climate). Mancur Olson, Olivier Goddard."”. Journal of Social Sciences and Humanities , vol. 9, no. 01, June 2019, p. 173, https://journals.univ-msila.dz/index.php/JOSSH/article/view/7646.