Gaya APA
A,, L, B, B.
(1975).
GEOLOGICAL HAZARDS
.
New York:
SPRGER- VERLAG BERLIN HEIDELBERG.
Gaya MLA
A,, LANDSLIDES-FLOODS, BPLT,, BRUCE.
"GEOLOGICAL HAZARDS".
New York:
SPRGER- VERLAG BERLIN HEIDELBERG,
1975.
Text.