Cita APA (7a ed.)

Spencer, R. (2014). Did Muhammad exist?: An inquiry into Islam's obscure origins (Paperback ed.). ISI.

Cita Chicago Style (17a ed.)

Spencer, Robert. Did Muhammad Exist?: An Inquiry into Islam's Obscure Origins. Paperback ed. Wilmington: ISI, 2014.

Cita MLA (9a ed.)

Spencer, Robert. Did Muhammad Exist?: An Inquiry into Islam's Obscure Origins. Paperback ed. ISI, 2014.