Gaya APA
Winkler, A, C., Mccuen, J, R. (1989).
Writing research paper : a handbook .
San Diego:
Harcourt Brace Jovanovich Pub..
Gaya MLA
Winkler, Anthony, C.., Mccuen, Jo, Ray.
"Writing research paper : a handbook".
San Diego:
Harcourt Brace Jovanovich Pub.,
1989.
Text.