Harvard:
Lau, S. xxxx, "A practical Cantonese-English dlctionary",
APA:
Lau, S. (xxxx). A practical Cantonese-English dlctionary. .
Chicago:
Lau, Sidney. xxxx. "A Practical Cantonese-English Dlctionary." .
MLA:
Lau, Sidney. "A Practical Cantonese-English Dlctionary." (xxxx): .
Citation within the text:
(Lau xxxx)
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BibTeX:
@article{lauxxxxpractical,
  title = {A practical Cantonese-English dlctionary},
  author = {LAU, Sidney},
  year = {xxxx},
  keywords = {China;Language;Linguistics;Reference},
  BAS = {344587},
  source = {bas},
}