William A. Haviland (2010). Anthropology: The Human Challenge, 13th edition (see Chapter 22). Thomson Wadsworth. ISBN978-0-495-81084-1)..{{cite book}}: ตรวจสอบค่า |isbn=: ตัวอักษรไม่ถูกต้อง (help)
Barth, Fredrik (1962). "The System Of Social Stratification In Swat, North Pakistan". ใน E. R. Leach (บ.ก.). Aspects of Caste in South India, Ceylon, and North-West Pakistan. Cambridge University Press. p.113. คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2010-09-19. สืบค้นเมื่อ 12 June 2007.
Elijah Obinna (2012). "Contesting identity: the Osu caste system among Igbo of Nigeria". African Identities. 10 (1): 111–121. doi:10.1080/14725843.2011.614412.
Shana Levin, Jim Sidanius (March, 1999). "Social Dominance and Social Identity in the United States and Israel: Ingroup Favoritism or Outgroup Derogation?". Political Psychology. 20 (1): 99–126. doi:10.1111/0162-895X.00138.{{cite journal}}: ตรวจสอบค่าวันที่ใน: |date= (help)
Ryan M. Quist & Miriam G. Resendez (2002). "Social Dominance Threat: Examining Social Dominance Theory's Explanation of Prejudice as Legitimizing Myths". Basic and Applied Social Psychology. 24 (4): 287–293. doi:10.1207/S15324834BASP2404_4.