Tohutoro APA (7th ed.)
Ubin, J. (1968). National Bilingualism in Paraguay. Mouton.
Tohutoru Kātū Chicago (17th ed.)
Ubin, Joan. National Bilingualism in Paraguay. The Hague, Paris: Mouton, 1968.
Tohutoro MLA (9th ed.)
Ubin, Joan. National Bilingualism in Paraguay. Mouton, 1968.
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