Setiyani, Aris, Djumarno Djumarno, Setyo Riyanto, and Lenny Ch. Nawangsari. 2019. “The Effect of Work Environment on Flexible Working Hours, Employee Engagement and Employee Motivation”. International Review of Management and Marketing 9 (3):112-16. https://www.econjournals.com/index.php/irmm/article/view/8114.