Gill, P. (2007). Business process outsourcing and call centre. Srishti Book Distributor.
Lua i Stíl Chicago (17ú heag.)Gill, Priya. Business Process Outsourcing and Call Centre. New Delhi: Srishti Book Distributor, 2007.
Lua MLA (9ú heag.)Gill, Priya. Business Process Outsourcing and Call Centre. Srishti Book Distributor, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.