Harvard:
Butler, K.D. xxxx, "Japanese for international businessmen",
APA:
Butler, K.D. (xxxx). Japanese for international businessmen. .
Chicago:
Butler, Kenneth D. xxxx. "Japanese For International Businessmen." .
MLA:
Butler, Kenneth D. "Japanese For International Businessmen." (xxxx): .
Citation within the text:
(Butler xxxx)
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BibTeX:
@article{butlerxxxxjapanese,
  title = {Japanese for international businessmen},
  author = {BUTLER, Kenneth D.},
  year = {xxxx},
  keywords = {Japan;Language},
  BAS = {105593},
  source = {bas},
}