Gaya APA
BUTZER, Karl W.. (1976).
Geomophology from the Earth .
USA:
Harper dan Row Publishers.
Gaya Chicago
BUTZER, Karl W..
Geomophology from the Earth.
USA:
Harper dan Row Publishers,
1976.
.
Gaya MLA
BUTZER, Karl W..
Geomophology from the Earth.
USA:
Harper dan Row Publishers,
1976.
.
Gaya Turabian
BUTZER, Karl W..
Geomophology from the Earth.
USA:
Harper dan Row Publishers,
1976.
.