Gaya APA
Wilson, W., Barnard, R. (1992).
Fifty-fifty : A Basic Course in Communicative English (Cet.3).
Englewood Cliffs, NJ.:
Prentice Hall.
Gaya MLA
Wilson, Warren., Barnard, Roger.
"Fifty-fifty : A Basic Course in Communicative English".
Cet.3
Englewood Cliffs, NJ.:
Prentice Hall,
1992.
Text.