خامسًا - الرسائل العلمية باللغة الإنجليزية: ١ - Muhammed Ibn Abd Al Wahhab (١٧٠٣ ٠٤ - ١٧٩٢) and Beginning of Unitarian Empire in Arabia, by George Rentz, ph. D. Dissertation, in History, ١٩٤٨.
٢ - The Ikhwan Movement of Najd: Its Rise, Development and Decline, by John S. Habib, The University of Michigan, Ph. D. ١٩٧١.
٣ - The Ikhwan of Saudi Arabia past and present, by Donna L. Zamiska, Megill University, Montreal, ١٩٨٣. A thesis in partial fulfilment of the requirment of the degree of master.