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Lua i Stíl Chicago (17ú heag.)Sallaabee, Ali Muhammad Muhammad. The Biography of Umar Ibn Al-Khattaab. 1st edition. Riyadh: Darussalam, 2010.
Lua MLA (9ú heag.)Sallaabee, Ali Muhammad Muhammad. The Biography of Umar Ibn Al-Khattaab. 1st edition. Darussalam, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.