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Ashkenazi, T. (1948). The ’Anazah Tribes. Southwestern Journal of Anthropology, 4(2), 222–239. http://www.jstor.org/stable/3628713

H. St. J. B. Philby. (1920). Southern Najd. The Geographical Journal, 55(3), 161–185. https://doi.org/10.2307/1781600

Haines, S. B. (1839). Memoir, to Accompany a Chart of the South Coast of Arabia from the Entrance of the Red Sea to Misenát, in 50° 43′ 25″ E. The Journal of the Royal Geographical Society of London, 9, 125–156. https://doi.org/10.2307/1797718

Helfritz, H. (1935). The First Crossing of Southwestern Arabia. Geographical Review, 25(3), 395–407. https://doi.org/10.2307/209308

Thomas, B. (1929). Among Some Unknown Tribes of South Arabia. The Journal of the Royal Anthropological Institute of Great Britain and Ireland, 59, 97–111. https://doi.org/10.2307/2843560

Anderson, S. (2014). Lawrence in Arabia: War, Deceit, Imperial Folly and the Making of the Modern Middle East. Atlantic Books Ltd.

Boxberger, L. (2012). On the Edge of Empire: Hadhramawt, Emigration, and the Indian Ocean, 1880s–1930s. SUNY Press.

J. E. Peterson. (1976) "The Revival of the Ibadi Imamate in Oman and the Threat to Muscat, 1913–20," Arabian Studies 3

Al-Maghafi, Fadhl (2012). "MORE THAN JUST A BOUNDARY DISPUTE: THE REGIONAL GEOPOLITICS OF SAUDI-YEMENI RELATIONS" (PDF). eprints.soas.ac.uk

Bang, Anne (1997). The Idrisi State in Asir 1906–1934. Hurst Publishers. pp. 111–114. ISBN 9781850653066.