Mayer, L. V. Fundamentals of voice & diction (10th ed.). Brown & Benchmark.
Lua i Stíl Chicago (17ú heag.)Mayer, Lyle V. Fundamentals of Voice & Diction. 10th ed. Iowa: Brown & Benchmark.
Lua MLA (9ú heag.)Mayer, Lyle V. Fundamentals of Voice & Diction. 10th ed. Brown & Benchmark.
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