Gaya APA
Cunningham, W, P., Saigo, B, W.
(2001).
Environmental Science
(
6)
.
USA:
Mc Graw Hill.
Gaya MLA
Cunningham, William, P.., Saigo, Barbara, Woodworth.
"Environmental Science".
6
USA:
Mc Graw Hill,
2001.
Text.