Gaya APA
INCORPORATED, G. (1978).
THE NEW BOOK OF POPULAR SCIENCE,Earth Sciences Energy Enviromental Sciences VOLUME 2 .
canada:
Grolier.
Gaya MLA
INCORPORATED, GROLIER.
"THE NEW BOOK OF POPULAR SCIENCE,Earth Sciences Energy Enviromental Sciences VOLUME 2".
canada:
Grolier,
1978.
Buku.