Gaya APA
HEUKEN, A.
(1976).
THE LANGUAGE OF AIR TRAVEL IN ENGLISH GROUND SERVICES
.
OXFORD:
PT GRAMEDIA USTAKA UTAMA.
Gaya MLA
HEUKEN, ADOLF.
"THE LANGUAGE OF AIR TRAVEL IN ENGLISH GROUND SERVICES".
OXFORD:
PT GRAMEDIA USTAKA UTAMA,
1976.
Text.