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2. BPO in PH. Inquirer.Net,2018
3. PH's Call Center Sector Remains as Strong Contributor to Economy,2018
4. Congress of the Philippines. Republic Act No. 7916, Otherwise Known as “The Special Economic Zone Act of 1995.”,1995
5. Noy hails Mar as father of Philippine BPO industry;Porcalla;Philstar Global,2015