APA Citation

(1986). The Encyclopedia Americana: Volume 21-Oporto to Photoengraving. Danbury: Grolier Incorporated.

Chicago Style Citation

The Encyclopedia Americana: Volume 21-Oporto to Photoengraving. Danbury: Grolier Incorporated, 1986.

MLA Citation

The Encyclopedia Americana: Volume 21-Oporto to Photoengraving. Danbury: Grolier Incorporated, 1986.

Warning: These citations may not always be 100% accurate.