อ้างอิง ของ ซิดนีย์ เหล่า

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  2. Stephen Matthews; Virginia Yip (1 September 2003). Cantonese: A Comprehensive Grammar. Routledge. pp. 13–. ISBN 978-0-203-42084-3.
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  4. Wong, Ki-fong. (2001). "Postgraduate Thesis: A study of Sidney Lau's 'a practical Cantonese-English dictionary'". Pokfulam, Hong Kong: The University of Hong Kong. สืบค้นเมื่อ 5 January 2014.
  5. Dew, J. (1980), "Review of Sidney Lau's A Practical Cantonese-English Dictionary", Journal of Chinese Linguistics, 8 (2): 305–315