Publications
Plessis, Theo Du. 2014. The South African Language Rights Monitor and information on language policy and planning in South Africa. Language Matters: Studies in the Languages of Africa 45 (3) : 378–400.
Plessis, Theo Du. 2013. Language conflict and change in language visibility in South Africa's Free State Province number plate case. Language Matters: Studies in the Languages of Africa 44 (3) : 126–148.
Plessis, Theo Du. 2012. The role of language policy in linguistic landscape changes in a rural area of the Free State Province of South Africa. Language Matters: Studies in the Languages of Africa 43 (2) : 263–282.
Plessis, Theo Du. 2012. Language-in-education policy development in Tanzania: An overview. Language Matters: Studies in the Languages of Africa 43 (2) : 184–201.
Plessis, Theo Du. 2010. Language visibility in the Xhariep - a comparison of the linguistic landscape of three neighbouring towns. Language Matters: Studies in the Languages of Africa 41 (1) : 72–96.
Plessis, Theo Du. 2010. Language planning from below: the case of the Xhariep District of the Free State Province. Current Issues in Language Planning 11 (2) : 130–151.
Plessis, Theo Du. 2009. Die Pan-Suid-Afrikaanse Taalraad en die regulering van taalsigbaarheid in Suid-Afrika - 'n ontleding van taalregteklagtes. Southern African Linguistics and Applied Language Studies 27 (2) : 173–188.
Plessis, Theo Du. 2009. Language visibility and the transformation of geographical names in South Africa. Language Matters: Studies in the Languages of Africa 40 (2) : 215–238.
Plessis, Theo Du. 2008. Perspectives on managing Afrikaans and English as 'equal' languages of learning and teaching at the University of the Free State. Southern African Linguistics and Applied Language Studies 26 (3) : 315–332.