Gaya APA
Knapp, Brian, Simon, McCrae, Duncan. (1989).
Challenge of the natural enviroment .
London:
Longman.
Gaya Chicago
Knapp, Brian, Simon, McCrae, Duncan.
Challenge of the natural enviroment.
London:
Longman,
1989.
Text.
Gaya MLA
Knapp, Brian, Simon, McCrae, Duncan.
Challenge of the natural enviroment.
London:
Longman,
1989.
Text.
Gaya Turabian
Knapp, Brian, Simon, McCrae, Duncan.
Challenge of the natural enviroment.
London:
Longman,
1989.
Print.