Lua APA (7ú heag.)
Ma, E., & Yiu, E. (2011). Handbook of voice assessments. Plural Publishing.
Lua i Stíl Chicago (17ú heag.)
Ma, Estella, agus Edwin Yiu. Handbook of Voice Assessments. San Diego: Plural Publishing, 2011.
Lua MLA (9ú heag.)
Ma, Estella, agus Edwin Yiu. Handbook of Voice Assessments. Plural Publishing, 2011.
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