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WikiPedia: Tiếng_Ga http://www.johannes-rebmann-stiftung.de/cms/en/mis... http://glottolog.org/resource/languoid/id/gaaa1244 http://ge.kasahorow.org/app/d http://www.moravianchurcharchives.org/thismonth/12... http://www.sil.org/iso639-3/documentation.asp?id=g... http://www.worldcat.org/title/christian-jacob-prot... https://www.ethnologue.com/language/gaa https://books.google.com/books?id=QvYNswEACAAJ&dq=... https://books.google.com/books?id=bzNGAAAAYAAJ&pri... https://www.youtube.com/watch?v=YzSlq2IIBzY