Gaya APA
Costinett, Sandra. (1994).
Spectrum 2: A Communicative Course in English .
New Jersey:
Prentice Hall.
Gaya Chicago
Costinett, Sandra.
Spectrum 2: A Communicative Course in English.
New Jersey:
Prentice Hall,
1994.
.
Gaya MLA
Costinett, Sandra.
Spectrum 2: A Communicative Course in English.
New Jersey:
Prentice Hall,
1994.
.
Gaya Turabian
Costinett, Sandra.
Spectrum 2: A Communicative Course in English.
New Jersey:
Prentice Hall,
1994.
.