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jstor.org
Breitbonde, L. B. (1991). "City, Countryside, and Kru Ethnicity". Africa. 61 (2): 186–201. doi:10.2307/1160614. JSTOR1160614.
McEvoy, Frederick (1997). "Understanding Ethnic Realities among the Grebo and Kru People of West Africa". Africa. 47 (1): 62–80. doi:10.2307/1159195. JSTOR1159195.