Gaya APA
Ambler, Eric. (1987).
The Dark Frontier .
London:
Collins ELT.
Gaya Chicago
Ambler, Eric.
The Dark Frontier.
London:
Collins ELT,
1987.
Buku.
Gaya MLA
Ambler, Eric.
The Dark Frontier.
London:
Collins ELT,
1987.
Buku.
Gaya Turabian
Ambler, Eric.
The Dark Frontier.
London:
Collins ELT,
1987.
Buku.