Gaya APA
DUBICKA, I., O'KEEFFE, M.
(2004).
English for international tourism :
(
2nd. ed.)
.
England:
Longman.
Gaya MLA
DUBICKA, Iwonna., O'KEEFFE, Margaret.
"English for international tourism :".
2nd. ed.
England:
Longman,
2004.
Buku.