Gaya APA
Howe, Brian. (1987).
Portfolio : case studies for business English .
Harlow:
Longman.
Gaya Chicago
Howe, Brian.
Portfolio : case studies for business English.
Harlow:
Longman,
1987.
Buku.
Gaya MLA
Howe, Brian.
Portfolio : case studies for business English.
Harlow:
Longman,
1987.
Buku.
Gaya Turabian
Howe, Brian.
Portfolio : case studies for business English.
Harlow:
Longman,
1987.
Buku.