Gaya APA
Potter, J., Kwok, T.
(2001).
Gogo loves English 4, Workbook
.
Hongkong:
Longman Asia ELT.
Gaya MLA
Potter, John., Kwok, Tony.
"Gogo loves English 4, Workbook".
Hongkong:
Longman Asia ELT,
2001.
Text / Book.