CAYNE, B. S. (1984). The encyclopedia Americana international edition Volume 21 Oporto to Photoengraving. Grolier Incorporated.
Chicago Style (17th ed.) CitationCAYNE, Bernard S. The Encyclopedia Americana International Edition Volume 21 Oporto to Photoengraving. Grolier Incorporated, 1984.
MLA (8th ed.) CitationCAYNE, Bernard S. The Encyclopedia Americana International Edition Volume 21 Oporto to Photoengraving. Grolier Incorporated, 1984.
Warning: These citations may not always be 100% accurate.