, A. (2013). Studying the Effects of Economic Activities on the World's Environmental System. Journal of Research Diyala humanity, 35(111), 159-186.
Ayad B. Abdulkaddir Al-Jalabi . "Studying the Effects of Economic Activities on the World's Environmental System". Journal of Research Diyala humanity, 35, 111, 2013, 159-186.
, A. (2013). 'Studying the Effects of Economic Activities on the World's Environmental System', Journal of Research Diyala humanity, 35(111), pp. 159-186.
, A. Studying the Effects of Economic Activities on the World's Environmental System. Journal of Research Diyala humanity, 2013; 35(111): 159-186.