Klein, T. B. (2000). "Umlaut" in optimality theory: A comparative analysis of German and Chamorro. Max Niemeyer Verlag.
Tohutoru Kātū Chicago (17th ed.)Klein, Thomas B. "Umlaut" in Optimality Theory: A Comparative Analysis of German and Chamorro. Tübingen: Max Niemeyer Verlag, 2000.
Tohutoro MLA (9th ed.)Klein, Thomas B. "Umlaut" in Optimality Theory: A Comparative Analysis of German and Chamorro. Max Niemeyer Verlag, 2000.
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