Gaya APA
Encyclopedia Americana : Oporto to Photoengraving. (2001).
United State America:
Grolier.
Gaya Chicago
Encyclopedia Americana : Oporto to Photoengraving.
Vol. 21.
United State America:
Grolier,
2001.
Text.
Gaya MLA
Encyclopedia Americana : Oporto to Photoengraving.
Vol. 21.
United State America:
Grolier,
2001.
Text.
Gaya Turabian
Encyclopedia Americana : Oporto to Photoengraving.
United State America:
Grolier,
2001.
Print.