Solomon Robert. (2016). The Art of Client Service (3rd.). Wiley India Pvt Ltd.
Lua i Stíl Chicago (17ú heag.)Solomon Robert. The Art of Client Service. 3rd. New Delhi: Wiley India Pvt Ltd, 2016.
Lua MLA (9ú heag.)Solomon Robert. The Art of Client Service. 3rd. Wiley India Pvt Ltd, 2016.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.