Gaya APA
Incorporated, G. (1983).
Encyclopedia Americana Volume 21 : Orley to Photoengraving .
Amerika:
Grolier Incorporated, Inc..
Gaya MLA
Incorporated, Grolier.
"Encyclopedia Americana Volume 21 : Orley to Photoengraving".
Amerika:
Grolier Incorporated, Inc.,
1983.
Text.