Gaya APA
Leech, G, N. et al
(2006).
English Grammar for Today: A New Introduction
(
1)
.
USA:
Palgrave Macmillan.
Gaya MLA
Leech, Geoffrey, N. et al.
"English Grammar for Today: A New Introduction".
1
USA:
Palgrave Macmillan,
2006.
Text.