De Bot, K., & Makoni, S. (2005). Language and aging in multilingual contexts. Multilingual Matters Ltd..
Lua i Stíl Chicago (17ú heag.)De Bot, Kees, agus Sinfree Makoni. Language and Aging in Multilingual Contexts. Clevedon ; Buffalo: Multilingual Matters Ltd., 2005.
Lua MLA (9ú heag.)De Bot, Kees, agus Sinfree Makoni. Language and Aging in Multilingual Contexts. Multilingual Matters Ltd., 2005.
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