| Commins, David Saudi Arabia 2009 | Lacey observes, "Forty is the number which bedouin often pick upon when they wish to describe a smallish body of men, and forty is the number of companions which Abdul Aziz is said to have had with him when he left Kuwait in September 1901 |
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| Bandar Salman Al Saud 1997 | A timeline of the arabs |
| A History of Saudi Arabia | From Bullard to Mr ChamberLain |
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| Rank and file Ikhwan fighters formed units in a new military institution, initially the White Army, eventually the National Guard | British Relations with Trans-Jordan, 1920—1930 |