Kawalya, Deo, et al. “Reconstructing the Origins of the Luganda (JE15) Modal Auxiliaries -Sóból- and -Yînz-: A Historical-Comparative Study across the West Nyanza Bantu Cluster.” SOUTH AFRICAN JOURNAL OF AFRICAN LANGUAGES, vol. 38, no. 1, Routledge Journals, Taylor & Francis Ltd, 2018, pp. 13–25, doi:10.1080/02572117.2018.1429855.