Gaya APA
EXTEBANK. ().
Madrid:
Economic Research Department.
Gaya Chicago
EXTEBANK.
.
Madrid:
Economic Research Department,
.
Text.
Gaya MLA
EXTEBANK.
.
Madrid:
Economic Research Department,
.
Text.
Gaya Turabian
EXTEBANK.
Madrid:
Economic Research Department,
.
Print.