Feinstein, A. H. (2002). Purchasing ed.5. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Feinstein, Andrew Hale. Purchasing Ed.5. John Wiley & Sons, 2002.
Lua MLA (8ú heag.)Feinstein, Andrew Hale. Purchasing Ed.5. John Wiley & Sons, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.