Harvard:
Paik, K.D. xxxx, "Common difficulties in English for non-native speakers", in Thesis, vol. 33, no. 10,
APA:
Paik, K.D. (xxxx). Common difficulties in English for non-native speakers. Thesis, 33 (10) , .
Chicago:
Paik, Kee Duk. xxxx. "Common Difficulties in English For Non-native Speakers." In Thesis, 33 , no. 10: .
MLA:
Paik, Kee Duk. "Common Difficulties in English For Non-native Speakers." Thesis. 33.10 (xxxx): .
Citation within the text:
(Paik xxxx)
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BibTeX:
@article{paikxxxxcommon,
  title = {Common difficulties in English for non-native speakers},
  author = {PAIK, Kee Duk},
  journal = {Thesis},
  year = {xxxx},
  volume = {33},
  number = {10},
  address = {Ph.D.},
  keywords = {Korea;Language},
  BAS = {457933},
  source = {bas},
}