Gaya APA
Ridwansyah, ., Flo, . (2006).
Mastering english grammar : all you want to know about grammar .
Jakarta:
Puspa Swara.
Gaya MLA
Ridwansyah, ., Flo, .
"Mastering english grammar : all you want to know about grammar".
Jakarta:
Puspa Swara,
2006.
Text.