Gaya APA
Hoiberg, D, H., Levy, M. (2011).
Britannica Global Edition. Volume 12 Global Warming - Haribhadra .
Chicago:
.
Gaya MLA
Hoiberg, Dale, H.., Levy, Michael.
"Britannica Global Edition. Volume 12 Global Warming - Haribhadra".
Chicago:
,
2011.
Ensiklopedia.