Gaya APA
Levin, Harold L.. (1983).
The Earth through time / Harold L. Levin (2nd ed.).
Philadelphia:
Saunders College.
Gaya Chicago
Levin, Harold L..
The Earth through time / Harold L. Levin.
2nd ed.
Philadelphia:
Saunders College,
1983.
Text.
Gaya MLA
Levin, Harold L..
The Earth through time / Harold L. Levin.
2nd ed.
Philadelphia:
Saunders College,
1983.
Text.
Gaya Turabian
Levin, Harold L..
The Earth through time / Harold L. Levin.
2nd ed.
Philadelphia:
Saunders College,
1983.
Print.