Gaya APA
Scientific american, volume 227. (1972).
New York:
Monthly.
Gaya Chicago
Scientific american, volume 227.
text.
New York:
Monthly,
1972.
Tesis.
Gaya MLA
Scientific american, volume 227.
text.
New York:
Monthly,
1972.
Tesis.
Gaya Turabian
Scientific american, volume 227.
New York:
Monthly,
1972.
Tesis.