Mohammed Yassin Mohd Aba Sha’ar, and NurLailaturRofiah. 2018. “‘Roaring Twenties’ and Its Impact on the Americans’ Identity Crisis: A Critical Analysis of Eugene O’Neill’s The Hairy Ape”. The Creative Launcher 2 (6):328-38. http://thecreativelauncher.com/index.php/tcl/article/view/830.