Tore Janson. 2000. "The History of the Minority-Language Speakers in Botswana." In Botswana: the Future of the Minority Languages, edited by Herman M. Batibo and Birgit Smieja. 3-12. Peter Lang.
Janson, Tore. 1995. "The Status, History and Future of Sekgalagadi." In The complete linguist: papers in memory of Patrick J. Dickens, edited by Anthony Traill et al.. 399-406. Rüdiger Köppe Verlag.
Jacquot, André. 1959. "La Langue Des Pygmées De La Sangha: Essai D’identification." In Bull. de l’Inst. d’Etudes Centrafricaines, 17/18: 35-42.