Gaya APA
Costinett, S., Byrd, D, R. (1987).
Spectrum: A Communication Course in English .
New Jersey:
Prentice Hall.
Gaya MLA
Costinett, Sandra., Byrd, Donald, R.H..
"Spectrum: A Communication Course in English".
New Jersey:
Prentice Hall,
1987.
Text.