Gaya APA
Publications handbooks and style manual. (1998).
America:
Society of Agronomy.
Gaya Chicago
Publications handbooks and style manual.
text.
America:
Society of Agronomy,
1998.
Tesis.
Gaya MLA
Publications handbooks and style manual.
text.
America:
Society of Agronomy,
1998.
Tesis.
Gaya Turabian
Publications handbooks and style manual.
America:
Society of Agronomy,
1998.
Tesis.