Gaya APA
Leech, G., Svartvik, J. (s.a).
A Communicative Grammar Of Engglish Geoffrey Leech Jan Svartvik .
S.l:
Longman.
Gaya MLA
Leech, Geoffrey., Svartvik, Jan.
"A Communicative Grammar Of Engglish Geoffrey Leech Jan Svartvik".
S.l:
Longman,
s.a.
Text.