Gaya APA
Environment science. (1978).
Philadelphia:
W.B. Saunders Company.
Gaya Chicago
Environment science.
2nd ed..
Philadelphia:
W.B. Saunders Company,
1978.
Buku.
Gaya MLA
Environment science.
2nd ed..
Philadelphia:
W.B. Saunders Company,
1978.
Buku.
Gaya Turabian
Environment science.
Philadelphia:
W.B. Saunders Company,
1978.
Buku.