Gaya APA
L.Abbott, P, .
(2006.).
Natural disasters.--
(
Ed.5.--)
.
Unites State:
Mc-Graw Hill.
Gaya MLA
L.Abbott, Patrick, .
"Natural disasters.--".
Ed.5.--
Unites State:
Mc-Graw Hill,
2006..
Buku.