Hasan, Susan Abed. “The Role of Sound Pressure Level and Sound Types in Achieving Comfortable Acoustic Environment for City Centers (Al-Karrada As Selective District in Baghdad City)”. Nahrain University College of Engineering Journal 18, no. 1 (January 2, 2015): Ar_1– 18. Accessed December 23, 2024. https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/168.