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Duffus, William (1883) “{{{1}}}”, in English-Chinese Vocabulary of the Vernacular or Spoken Language of Swatow, Swatow: English Presbyterian Mission Press, page 1
Duffus, William (1883) “{{{1}}}”, in English-Chinese Vocabulary of the Vernacular or Spoken Language of Swatow, Swatow: English Presbyterian Mission Press, page 1