Gaya APA
The changing earth. (1993).
tempaterbit:
penerbit.
Gaya Chicago
The changing earth.
Edisi.
tempaterbit:
penerbit,
1993.
Text.
Gaya MLA
The changing earth.
Edisi.
tempaterbit:
penerbit,
1993.
Text.
Gaya Turabian
The changing earth.
tempaterbit:
penerbit,
1993.
Print.