SCHAEFER, Ronald P. On the Motivation and Structure of a Strengthening Process in Tswana. Kansas Working Papers in Linguistics, [S. l.], v. 5, p. 119–164, 1980. DOI: 10.17161/KWPL.1808.549. Disponível em: https://journals.ku.edu/kwpl/article/view/17300. Acesso em: 10 apr. 2025.