Rujukan Bahasa-bahasa Kru

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  2. Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, penyunting (2017). "Siamou". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
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  5. 1 2 3 Bahl, Taru; Syed, M. H., penyunting (2003). Encyclopaedia of Muslim World. New Delhi: Ammol Publications. m/s. 24–25. ISBN 9788126114191.
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  7. Fisiak, Jacek (1984). Historical Syntax. New York: Mouton.
  8. Marchese, Lynell. 1989. Kru. In Bendor-Samuel, John (ed.), The Niger-Congo Languages: A Classification and Description of Africa's Largest Language Family, 119-139. Lanham MD, New York & London: Lanham: University Press of America.
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  10. Chan, Eugene (2019). "The Niger-Congo Language Phylum". Numeral Systems of the World's Languages.
  11. Marchese Zogbo, Lynell. 2012. Kru revisited, Kru revealed. Paper presented at the International Congress "Towards Proto-Niger-Congo: Comparison and Reconstruction," Paris, 18‒21 September. (Abstract)
  • Westerman, Diedrich Hermann (1952) Bahasa Afrika Barat (Bahagian II). London/New York/Toronto: Oxford University Press.