Fisher, H. B. (1975). Improving voice and articulation (2nd ed.). Houghton.
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Chicago-čujuhus (17. p.)
Fisher, Hilda B. Improving Voice and Articulation. 2nd ed. Boston: Houghton, 1975.
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MLA-čujuhus (9. p.)
Fisher, Hilda B. Improving Voice and Articulation. 2nd ed. Houghton, 1975.
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