Gaya APA
Ambler, Erick.. (1987).
The Dark frontier .
London:
Collins ELT.
Gaya Chicago
Ambler, Erick..
The Dark frontier.
London:
Collins ELT,
1987.
Text.
Gaya MLA
Ambler, Erick..
The Dark frontier.
London:
Collins ELT,
1987.
Text.
Gaya Turabian
Ambler, Erick..
The Dark frontier.
London:
Collins ELT,
1987.
Print.