Mortimer, C. (1989). Elements of Pronunciation: Intensive Practice for Intermediate and More Advanced Students. Sông Bé: Tổng hợp.
Chicago-tyylinen lähdeviittausMortimer, Colin. Elements of Pronunciation: Intensive Practice for Intermediate and More Advanced Students. Sông Bé: Tổng hợp, 1989.
MLA-viiteMortimer, Colin. Elements of Pronunciation: Intensive Practice for Intermediate and More Advanced Students. Sông Bé: Tổng hợp, 1989.
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