Lua APA (7ú heag.)
Spencer, R., & Jansen, J. J. G. (2012). Did Muhammad exist?: An inquiry into Islam's obscure origins. ISI Books.
Lua i Stíl Chicago (17ú heag.)
Spencer, Robert, agus Johannes J. G. Jansen. Did Muhammad Exist?: An Inquiry into Islam's Obscure Origins. Wilmington, Delaware: ISI Books, 2012.
Lua MLA (9ú heag.)
Spencer, Robert, agus Johannes J. G. Jansen. Did Muhammad Exist?: An Inquiry into Islam's Obscure Origins. ISI Books, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.