Davidkov, Tsvetan, and Desislava I. Yordanova. “Exploring Internal and Environmental Moderators of Entrepreneurial Orientation - Performance Relationship in Bulgarian Enterprises”. International Review of Management and Marketing, vol. 7, no. 2, Mar. 2017, pp. 27-34, https://econjournals.net.tr/index.php/irmm/article/view/3293.