Bản mẫu:Cite DPCE
Upton, Clive; Kretzschmar, William A. Jr. (2017). The Routledge Dictionary of Pronunciation for Current English (ấn bản 2). Routledge. ISBN 978-1-138-12566-7.
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Upton, Clive; Kretzschmar, William A. Jr. (2017). The Routledge Dictionary of Pronunciation for Current English (ấn bản 2). Routledge. ISBN 978-1-138-12566-7.