1. Aitchison, J. 2004. Language Change: Progress or Decay? Cambridge: Cambridge University Press.
2. Arndt, J. S. 2022. Divided by the Word: Colonial Encounters and the Remaking of Zulu and Xhosa Identities. Charlottesville, VA: University of Virginia Press.
3. Mutual lexical borrowings among some languages of southern Africa: Xhosa, Afrikaans and English
4. Code-convergent borrowing in Louisiana French
5. Lessons on the Frontier: Aspects of Eastern Cape History;Bundy C.;Kronos: Journal of Cape History,2004