Gaya APA
Encyclopedia Americana : Volume 21 ( Orley to Photoengraving ). (1980).
Amerika:
Grolier International.
Gaya Chicago
Encyclopedia Americana : Volume 21 ( Orley to Photoengraving ).
Volume 21.
Amerika:
Grolier International,
1980.
Buku.
Gaya MLA
Encyclopedia Americana : Volume 21 ( Orley to Photoengraving ).
Volume 21.
Amerika:
Grolier International,
1980.
Buku.
Gaya Turabian
Encyclopedia Americana : Volume 21 ( Orley to Photoengraving ).
Amerika:
Grolier International,
1980.
Buku.