Daradkeh, Yousef, Dren Selimi, and Luis Borges Gouveia. “E-BOOKS Vs. P-BOOKS: WHO’S PROFITING?”. European Scientific Journal, ESJ 8, no. 6 (March 18, 2012). Accessed April 20, 2025. https://test.eujournal.org/index.php/esj/article/view/109.