Gaya APA
Energy future. (s.a.).
New York:
Ballatine Books.
Gaya Chicago
Energy future.
.
New York:
Ballatine Books,
s.a..
Text.
Gaya MLA
Energy future.
.
New York:
Ballatine Books,
s.a..
Text.
Gaya Turabian
Energy future.
New York:
Ballatine Books,
s.a..
Print.