Crystal David (2000). Language Death. Cambridge: Cambridge University Press.
Crystal, David (2003). English as a Global Language.
Davies, Alan (2013). Native Speakers and Native Users: Loss and Gain. Cambridge: Cambridge University Press.
European Commission (2012). How to write clearly.
https://op.europa.eu/*****
Holm, John (2000). An introduction to Pidgin and Creole Studies. Cambridge: Cambridge University Press.
Hosokawa, Naoko (2023). Loanwords and Japanese Identity: Inundating or Absorbed? Abingdon: Routledge.
Iori, Isao (2016). The Enterprise of Yasashii Nihongo: For a Sustainable Multicultural Society in Japan. Hitotsubashi University Departmental Bulletin Paper, 10: 4-19.
Kachru, Braj. (1992). World Englishes: approaches, issues, and resources. Language Teaching, 25: 1-14. Cambridge University Press.
Pearce, Fred (2015). The New Wild: Why Invasive Species Will be Nature's Salvation
Radtke, Edgar, Große, Sybille, and Felder, Ekkehard (2019). Language institutions and language criticism in European perspective. HESO, 4: 51–56.
Thomas, George (1991). Linguistic purism. London and New York: Longman.