Newell, F. (2000). Loyalty.com. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Newell, Frederick. Loyalty.com. Chichester: John Wiley & Sons, 2000.
Lua MLA (9ú heag.)Newell, Frederick. Loyalty.com. John Wiley & Sons, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.