Danielle Resnick. Urban Poverty and Party Populism in African Democracies. Cambridge University Press. 2013: 165. ISBN 978-1-107-65723-6., Quote:"One reason for the low salience of ethnic identity is because, like some other West African societies, many ethnic groups in Senegal are structured by caste. For example, the Wolof, Serer, and Pulaar-speaking Toucouleur are all caste societies."
Tal Tamari. The Development of Caste Systems in West Africa. The Journal of African History (Cambridge University Press). 1991, 32 (2): 221–250. JSTOR 182616. doi:10.1017/s0021853700025718., Quote: "[Castes] are found among the Soninke, the various Manding-speaking populations, the Wolof, Tukulor, Senufo, Minianka, Dogon, Songhay, and most Fulani, Moorish and Tuareg populations, (...) They are also found among (...) and Serer groups."
Tal Tamari. The Development of Caste Systems in West Africa. The Journal of African History (Cambridge University Press). 1991, 32 (2): 221–250. JSTOR 182616. doi:10.1017/s0021853700025718., Quote: "[Castes] are found among the Soninke, the various Manding-speaking populations, the Wolof, Tukulor, Senufo, Minianka, Dogon, Songhay, and most Fulani, Moorish and Tuareg populations, (...) They are also found among (...) and Serer groups."
