Gaya APA
Scientific american, volume 225. (1971).
New York:
Monthly.
Gaya Chicago
Scientific american, volume 225.
text.
New York:
Monthly,
1971.
Tesis.
Gaya MLA
Scientific american, volume 225.
text.
New York:
Monthly,
1971.
Tesis.
Gaya Turabian
Scientific american, volume 225.
New York:
Monthly,
1971.
Tesis.