UMAR, A. S. (2010). HOTSPOT BILLING SYSTEM.
Lua i Stíl Chicago (17ú heag.)UMAR, AHMAD SYAIFUL. HOTSPOT BILLING SYSTEM. 2010.
Lua MLA (9ú heag.)UMAR, AHMAD SYAIFUL. HOTSPOT BILLING SYSTEM. 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.