The Effect of Coordination Between Administrative Units on The Effectiveness of Purchasing – Research and Empirical Study on The Employees of Commercial Companies - Unaizah, Saudi Arabia –. JEALS [Internet]. 2020 Dec. 30 [cited 2024 May 18];4(15):164-50. Available from: https://journals.ajsrp.com/index.php/jeals/article/view/3135