Vydrin, Valentin (2020). "Dan". In Vossen, Rainer; Dimmendaal, Gerrit J. (eds.). The Oxford Handbook of African Languages. Oxford: Oxford University Press. pp. 451–462. doi:10.1093/oxfordhb/9780199609895.013.66. ISBN9780199609895.
ethnologue.com
Dan at Ethnologue (18th ed., 2015) (subscription required) Kla at Ethnologue (18th ed., 2015) (subscription required)